Nolan is *not* basically Malcolm Reynolds. He's basically Han Solo (Berlin even called him out on it on the show.)
Honestly, I see him as a mixture of both. I suspect the main reason he was compared to Han Solo on the show was because he is the bigger pop culture icon and therefore more likely to be talked about among non-sci-fi fans thirty years in the future.
But really none of that originated with Firefly. Even thought Firefly is great, a lot of the stuff you mention in the spoilers had been done before in other things.
And I did say in my first post I wasn't holding Firefly up on a pedestal of originality. I realize it didn't create any of this stuff, but the similarity is still there regardless.
Besides, in science fiction in general there has been a lot of Firefly emulating in recent years. I read a novel series a couple of years ago where the author actually promoted it as "Firefly inspired" though aside from being about a crew of scavengers, there wasn't much similarity. So I've tended to assume if it's similar to Firefly, it probably is inspired by it.
Ironic, really. For a show cancelled after a little over a dozen episodes with a movie which didn't really smash any records at the box office, it sure generated a lot of imitators.