Mirage 20-40: What Do You Make of This Card Checking Tell?

[Dynasty]

This was a weekend 20-40 game at the Mirage. The key player in question seemed to be an observant player who didn't get out of line. I've been at the table for about an hour and a half and have put on my typical exhibition of folding.

The hand:

An MP joins the game and posts. UTG folds. I'm UTG+1, pick up A[img]/images/graemlins/diamond.gif[/img]K[img]/images/graemlins/heart.gif[/img], and raise. The next player folds. The new MP poster calls. Another MP calls.

The observant player is in the cutoff and cold-calls the raise. Everybody else folded to the Big Blind who called. Five players saw the flop with 10 small bets in the pot.

The flop is: A[img]/images/graemlins/heart.gif[/img]8[img]/images/graemlins/club.gif[/img]5[img]/images/graemlins/club.gif[/img]

The Big Blind checked and I bet my top pair/top kicker. The two MPs folded to the Cutoff. He called without giving any sign of strength or weakness. The Big Blind also called. Three players saw the turn with 6.5 big bets in the pot.

The turn is: A[img]/images/graemlins/heart.gif[/img]8[img]/images/graemlins/club.gif[/img]5[img]/images/graemlins/club.gif[/img]6[img]/images/graemlins/spade.gif[/img]

The Big Blind checked. I bet. The Cutoff called. The Big Blind folded. The river was seen heads-up with 8.5 big bets in the pot.

After the turn action was complete, the Cutoff rechecked his hole cards. It really caught my eye. It seemed to me he was double-checking for something specific. I do not believe the Cutoff noticed me picking up on this. He seemed genuinely interested in his own cards.

What do you make of a hole card recheck in this spot?

The river is: A[img]/images/graemlins/heart.gif[/img]8[img]/images/graemlins/club.gif[/img]5[img]/images/graemlins/club.gif[/img]6[img]/images/graemlins/spade.gif[/img]2[img]/images/graemlins/diamond.gif[/img]

What's your play if you think AK is good? If you think it's not good?