Sure. Thats almost always the rule in fiction.
However, BBC can, and has, credit the writer of a BF piece of work for inspiration for a similarly structured story. Case in point, the Cybermen two-part story in season 2, which credited Marc Platt, the writer of BF's Spare Parts, for the inspiration of the story.
So, they basically took the premise of a Big Finish audio, and made it canon, since the original version
wasn't canon. I'm not saying Big Finish hasn't done good or even great stories, just that they don't count as canon.
There's also the matter of fan-fiction. its not. Commerical fan-fiction is inherently a contradictory term, since it implies that one of those two is wrong. And BF is certainly commercial, and it has impact on what happens on TV, because it directly inspired the aforementioned two-parter.
Inspiring a story, like I say above, actually hurts the "BF is canon" argument. They can inspire episodes of the show, but they aren't part of the show. I could see that.
What a show-runner is still something that I can't forsee. But like I keep telling you, the BBC and BF work in tandem. That means, the BBC department of DW (and not Moffat himself, as you incorrectly assume) has to approve the scripts that BF works on at all relevant ranges, and as such there's a clear co-operation between the entities to keep a certain consistency between the properties and maintain a level of surprise for both - like, BF cannot do a Robin Hood story, because they'll release their own, or BF will use Nazi Germany as a setting, so any writer may be wary of that.
That's normal tie-in oversight, it doesn't make the stories canon. The BBC just doesn't want BF to step on the toes of the TV show, or release a story it doesn't think should be associated with the show.
Long story short, BF's stuff is officially sanctioned by the BBC, to the extent that it extended their licence up until 2020. Which means, whatever happens, they'll be making canonical, proper DW.
No, it means it will be releasing non canon tie in stories until 2020.
As far as I'm concerned, The Ultimate Foe goes right into Time and the Rani.
And that literally makes no sense, as the Sixth Doctor wear different clothing in these two stories, as does, more noticeably, Mel herself! And besides, there's the very obvious matter that Mel is out of her time stream there - in fact, she's from the Doctor's future, and needs to return there.
We don't know where Mel is from, we never see how she met the Doctor.
Furthermore, there's clearly a passage of time passed, as Mel herself comments how they've travelled for a while now.
We don't know how long they were traveling before
Terror of the Vervoids. I guess, thinking back, they did say that
Terror of the Vervoids took place in the Doctor's future. So, I guess I have to rearrange my timeline
The Ultimate Foe to
Terror of the Vervoids (the events shown in the courtroom obviously, not the courtroom scenes themselves) to
Time and the Rani. We have no idea how Mel met The Doctor, and it can't fit anywhere. So, the way I figure it, The Doctor must not have gone directly from the events shown in
Mindwarp to the courtroom. He must have had an adventure where he met Mel in between, otherwise nothing makes sense, even though it was clearly supposed to be him going directly from
Mindwarp to the courtroom. Then, when he was brought to the courtroom, he forgot the events of both
Mindwarp and meeting Mel (we know he forgot
Mindwarp), meaning that from his perspective, she was from his "future", even if he'd already met her and just couldn't remember. The writers couldn't fix the meeting Mel thing since Colin was fired before we saw him meeting mel, so the way I've laid out events is the only way I can see it happening, if we just go by on screen, canon sources.
You're dismissal of BF is unimportant, as its canonical and fan-fiction you'll find on the internet is not.BF also uses the original actors to play those parts, and specifically too - not a peripheral time traveller or something like the BBV Productions did.
I can point to, for example, several Trek fan films that use the original actors, and that doesn't make them canon with anything.
Its lame, because it doesn't make sense at all, as I said earlier. For the same reasons. Simply put, it couldn't happen, and thanks to Big Finish, it didn't happen. The Sixth Doctor had loads of adventures inbetween The Ultimate Foe and Time and the Rani. Thankfully.
No, they didn't. They had almost certainly one, I'll give you that, but I can't see him having more than one, and there is no canon story to fit in there.
And seriously, what do you have against BF? The Sixth Doctor's fantastic in it, and he develops and progresses in a meaningful, fullfilling manner that is most satisfying, in the long run. He's one of my favorite Doctors, as a result.
Apparently all he does is get a stupid blue coat and become the 5th Doctor. He's my favorite Doctor because of the real, in canon stories he was in. Toning him down for the people who were upset that he wasn't Peter Davidson, and that refused to look past his coat, just makes BF jerks. I mean, I guess selling out and ruining the 6th Doctor was the only way to make him more acceptable to the people who hated his era, but as a fan of the real version, its the big reason I've gone from just ignoring and not caring about BF to borderline hating them.
The real sixth doctor is an irritable timelord in a colorful coat who got two seasons worth of adventures. Big Finish's 6th-in-name-only is basically giving a big middle finger to people who like the real 6th Doctor, and I'd probably be more angry if the stories were remotely canon, which they aren't. The original, televised 6th Doctor still the only canon version.
I haven't gotten there, but it seems like the Seventh became a very sombre, weary character near the end, and maybe was welcoming the cheerier Eighth Doctor to come. I can't say - yet.
I guess after Ace finally left him after all the mental torture, he probably got lonely. She's just lucky he didn't kill her, which would have been my guess about how their relationship ended if an episode of the SJ Adventures hadn't confirmed Ace being alive and well.
Of course they do. Thats where the intent of the author comes useful. Moffat clearly wrote that as a shout-out to Big Finish. He didn't invent those companions, he clearly was referencing characters that the Eighth Doctor interacted with.
Oh, it was obviously Moffat's intent to reference BF. But, until we see them on screen, all we know from an in universe perspective is that the 8th Doctor knew some people who coincidentally had the same names of a few BF characters.
Besides, even if we go with this lame logic, C'rizz's name is just C'rizz, which by association ties Charley with him, which by association ties the rest of them.
I don't even know what this means. There is no reason for the names Charley and C'rizz to have any connection outside of Big Finish, or for C'rizz's name to be unique, so it means nothing when it comes to canon. I already said Moffat obviously took the names from BF, we just have no way of knowing, in canon, who the names are attached to and what relationships they had with The Doctor.