KK facing pot sized river bet (PS $162)

[JSchnett]

Sorry no reads. I had been tight (obv)

PokerStars Game #13267274625: Tournament #66640482, $150+$12 Hold'em No Limit - Level VII (100/200) - 2007/11/15 - 22:49:26 (ET)
Table '66640482 97' 9-max Seat #5 is the button
Seat 1: WiLDmAn75 (26115 in chips)
Seat 2: nargnice (11190 in chips)
Seat 3: dicknastyjr (4480 in chips)
Seat 4: HpNOtiC (5462 in chips)
Seat 5: elio82 (20987 in chips)
Seat 7: diegel (9180 in chips)
Seat 8: ulty_dude (9535 in chips)
Seat 9: JSchnett (9011 in chips)
WiLDmAn75: posts the ante 10
nargnice: posts the ante 10
dicknastyjr: posts the ante 10
HpNOtiC: posts the ante 10
elio82: posts the ante 10
diegel: posts the ante 10
ulty_dude: posts the ante 10
JSchnett: posts the ante 10
diegel: posts small blind 100
ulty_dude: posts big blind 200
*** HOLE CARDS ***
Dealt to JSchnett [Kh Kc]
JSchnett: raises 400 to 600
WiLDmAn75: folds
nargnice: folds
dicknastyjr: folds
HpNOtiC: folds
elio82: folds
diegel: calls 500
ulty_dude: folds
*** FLOP *** [Tc 8d 2h]
diegel: checks
JSchnett: bets 1000
diegel: calls 1000
*** TURN *** [Tc 8d 2h] [Ah]
diegel: checks
JSchnett: checks
*** RIVER *** [Tc 8d 2h Ah] [3s]
diegel: bets 3480 (exactly pot)
JSchnett:


Generally I think that these bets are for value but I had trouble putting him on a hand that he would play this way. I don't think hes calling in the sb with A2/A8, AT could be a possiblilty but seems strange for him to c/c the flop with TPTK.

Could be 22/88 even TT but I highly doubt it is AJ/AQ considering it would be a terrible valuebet and they would have had to call on the flop.

thoughts?