Poker Hand from the Mookie

Full Tilt Poker, NL Hold'em Tournament, 60/120 Blinds, 9 Players

LeggoPoker.com - Hand History Converter

BB: 5,515
UTG: 4,710
UTG+1: 3,360
UTG+2: 3,920
MP1: 6,030
MP2: 3,640
Hero (CO): 9,820
BTN: 1,625
SB: 3,410

Pre-Flop: (180) K K dealt to Hero (CO)

5 folds,
Wwonka raises to 420 (Raising KK here nothing special),
BTN folds,

Bayne raises to 1,380, I can see him trying to resteal here

BB REraises to 5,515 and is All-In, Ok this is the one that worries me

wwonka69 calls 5,095, (I am not folding KK here)

Bayne calls 2,030 and is All-In (What COULD HE CALL WITH HERE?AA, KK,QQ,JJ, AK MAYBE?)

Flop: (14,440) 2 7 4 (3 Players - 1 is All-In)
Turn: (14,440) T (3 Players - 1 is All-In)
River: (14,440) A (3 Players - 1 is All-In)

Results: 14,440 Pot

BB showed K K (a pair of Kings) and WON 2,105 (-3,410 NET)

Wwonka69 showed K K (a pair of Kings) and WON 2,105 (-3,410 NET)

BAYNE showed A T (two pair, Aces and Tens) and WON 10,230 (+6,820 NET)

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Wow I will say I was shocked that Bayne would make that call with AToff suit. The resteal was fine but calling off your stack with ATo seems crazy to me.
What could he Possibly be ahead of? If either of us has a Bigger Ace he is way behind.
Or is he just too short to fold once he gets reraised all in and then a call before it gets back to him?

Thoughts?