I've seen everything you list there for Cumberbatch. I've seen about everything the guy has done since 2005. He's stiff. I agree with you that he would make a good Master, but he is a limited actor.
I haven't seen the two films you mention for Caine. I'll check them out.
Your inability to think outside the box when it comes to an actor's suitability to a role isn't my problem, so why do I need to "support" my "thesis"? We're going to disagree on this all day, so there's no point.