$16 - KK, ace hits for a change

[mattiesmat]

I did not want to scare them both away by squeezing preflop, so I raised to 600 and hoped at least 1 would call.
Then an ace flopped and the short stack pushed.
Can I assume one of them has an ace and fold the flop?

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) by Hand Converter CG

MP1 (t1700)
MP2 (t2170)
MP3 (t2225)
CO (t1005)
Button (t1295)
SB (t945)
Hero (t1460)
UTG (t1365)
UTG+1 (t1335)

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">MP1 raises to t150</font>, <font color="#666666">4 folds</font>, SB calls t125, <font color="#CC3333">Hero raises to t600</font>, MP1 calls t450, SB calls t450.

Flop: (t1800) 4[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets t345 (All-In)</font>, Hero folds, MP1 calls t345.

Turn: (t2490) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

River: (t2490) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: t2490