These two would have been pitted against each other (it's a damn shame it'll never happen), who would have won and how?
It's a FOTY candidate kinda fight, IMO. Non-stop action.
faber, possibly by a finish 
I've said this many times, would be an amazing fight vtfu.
Yeah, this is a winner in my book. I've always thought Edgar vs Chad mendes would be fun too 
I don't think Faber can get or keep Edgar down and I think if BJ and Aldo can't stop Frank on the feet, Urijah isn't likely to. I think Frank would win the decision, although I could also see Urijah taking the decision by virtue of being higher ouput and consistently more aggressive.
If it's a title fight, Edgar.
For some reason I read Aldo vs Faber @ 145 and was thinking WTF.
But yea, Edgar/Faber would be a fun fight.
I'd love to see it. I would give the edge to Faber just because he's more of a finisher.