I'm not going to quote the book here, but page 176 where Mimic Abilities is...in the last paragraph of the first effect of the power. That holds the only answer I'll ever need.
That paragraph SHOULD be tacked on to the end of both of the other effects. It strikes me as ridiculously obvious that was the intent, but just didn't happen. Silly them, thinking they wouldn't have to repeat themselves for each of the effects.
To me, it says you can't cherry-pick powers like you can with Modular Abilities, they come and go in a group. At best, it can be a set of POWERS from one target, a set of STUNTS from another target, and a set of SKILLS from yet another target. Even if each "set" is only a single power, stunt, or skill...if you swipe off of someone else, it's gone...replaced by the new batch.
But hey, admittedly, that's merely my interpretation alone. I think it works well and makes the power still worthwhile.
I agree that someone who tries to start with 11 superb skills is just being a prick, no matter how "justified" their story is. And frankly, NO pre-game story could ever reasonably justify that, period. As stated before, such a story would have to be agreed upon by all players and the GM as both interesting and fun for all. That just isn't possible with that kind of crap.
That said...it should totally be fair game for NPCs to cherry-pick hardcore. Bad-ass NPCs are the bread and butter of good gaming...again, in my opinion.