22$ thin value bet with ak?

[donkeykong2]

well maybe it s absolutely standard but i dont see a lot of hands with action after the flop posted here so i post this one. i started out with a heater into this session so maybe i got a bit overconfident in some spots. from the timing of his bets i kinda thought he was weak because he checked pretty quickly on turn and river seemingly scared of a bet.
no reads before this hand though:

Poker Room skin
No Limit Holdem Tournament
Blinds: t15/t30
5 players
Converter

Stack sizes:
UTG: t1190
CO: t1420
donkeykong2: t1360
SB: t1360
BB: t2170

Pre-flop: (5 players) donkeykong2 is Button with A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img]
2 folds, <font color="#cc0000">donkeykong2 raises to t90</font>, SB calls t75 <font color="aaaaaa">(pot was t135)</font>, BB calls t60 <font color="aaaaaa">(pot was t210)</font>.

Flop: T[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (t270, 3 players)
SB checks, BB checks, <font color="#cc0000">donkeykong2 bets t200</font>, SB calls t200 <font color="aaaaaa">(pot was t470)</font>, BB folds.

Turn: 7[img]/images/graemlins/diamond.gif[/img] (t670, 2 players)
SB checks, <font color="#cc0000">donkeykong2 bets t300</font>, SB calls t300 <font color="aaaaaa">(pot was t970)</font>.

River: 2[img]/images/graemlins/heart.gif[/img] (t1270, 2 players)
SB checks, <font color="#cc0000">donkeykong2 is all-in t770</font>, <font color="#cc0000">SB calls all-in t770</font>.

Results:
Final pot: t2810

i thought he was much more likely to have an ace here than the flush draw just from the relative proportion. also i thought his turn/river play didnt indicate a flush.
what do you think of my turn/river play?