He really doesn't have to have AA to make that bet. And even if he does:
Result
http://twodimes.net/h/?z=1045285
pokenum -h kc qc - ad ah -- kd 3c 5c
Holdem Hi: 990 enumerated boards containing 5c 3c Kd
cards win %win lose %lose tie %tie EV
Kc Qc 493 49.80 497 50.20 0 0.00 0.498
Ad Ah 497 50.20 493 49.80 0 0.00 0.502
So you'd love to get your chips in here.