[hornpout]

as far as the hypothetical question goes. think about players intentions...

"you got me" and pushing cards forward face down is a concession. -if player b mucks his aces without showing, it wouldnt matter what player a shows.

reason 1... player a realizes he has a straight. player b could have mucked a higher straight or same hand for a chop. -youd never know because he mucked when player a conceded.

reason 2...angle shooting is naughty.

since the aces were shown and the straight was discovered, the player with the aces humped himself and the pot was rewarded the to correct hand because cards do read.