[jjk22]

12 person home tourney, 100 starting chips, 2nd round, blinds 2-4, 6 players at my table, stacks all pretty even.

5th position calls 4.
Button raises to 8.
SB calls, BB calls, 5th position folds, 28 chip pot.
Flop 2-4-5 multi-colored.
SB bets 30, BB folds, button calls.
Turn J-check check.
River 3-check, button bets 50 (nearly all his stack), hero calls (nearly all his stack).
Button wins with A-8 offsuit. Has wheel. SB had KK.
Does button's play make sense? Calling the flop bet?
Does hero's play make sense? Calling the river bet?