His sizing is confusing, seems bad to me at first glance. Betting very small turn and then overbetting the river on this runout looks a bit fishy to me.

Not sure what to make out of it though. If he's indeed a fishy player that is not used to thinking about the evolution of the size of the pot in relation to bet sizing, then I'd be somewhat more inclined to fold, because he's likely scared money, and won't make the big shove without having the nuts. Adding to that, you saw him play cautiously, and this is the SCOOP main event, you shall expect people to get less out of line than usual.

As for the gut feeling, I'm an advocate of trusting it more often than not.

Your hand is an excellent bluff catcher (no Kh) but this looks so much like 66s to me that I could not make a very deep analysis. He doesn't have that many bluffs, 54s and some hearts. But this bet OTR is just amazingly strong that I call this almost never. 

Its very annoying he doesn't even set up a pot-sized river shove, but I don't think he was even thinking that far ahead he just didn't want me to fold turn, which makes me want to fold
even more and. I was contemplating whether he would do this with A3s, A6s etc.
but I think its unlikely and although I could be chopping with  AK,  that may be one of a few hand that he would be willing to 3bet in position here, but I  also don't think he would flat pre w AK and then raise me on Axx.

yeah was my major concern. folding to this hands. but they are just 2 combos (suited) and even in a narrow range that is what we get to the river, the probability distribution given the information for this hands are much lower than 66s, in my view. and even though this boards has some draws, you have almost none of them and he does not need to worry much facing another Ax with just 3 outs. Also, probably his range is more suited heavy than yours but not my much. So, for these reasons I think we are behind here.

I honestly don't know what to make of his river rip after turn bet sizing, although I'd think his flop nearly 3x but just shy raise vs your small cbet is less likely a draw than strength vs an in line player.  If he is raising a flush on flop I'd think he'd bet bigger on turn to set up under PSB river for value or bluff, so would agree with above posters he's probably trying to keep you in.

That said, I'm not so crazy about the OOP sizings this deep, but then again I'm predominantly a MSMTT player.  You're just giving him a great price to be flatting really wide IP vs you with a hand that wants to be getting value, but is only TPTK w/ a backdoor draw for 80+bb you dont exactly want a lot of heat later in the hand.  My bet sizing is going to be much closer to half pot on this flop (not over it, but defo not this small).  And pre 100bb deep I'd think 2.5x from MP is ideal, again, this deep you're just giving IP players and blinds crazy odds.

I think we can fold flop here pretty safely given his stats. Definitely folding river but it should not cost you 2 calls to realize that. Also, based on flop play, river should almost never be a fold but hey, sometimes we make a bad call and it doesn't mean you make another bad call to follow through with the plan. 

I don't see what plan you had on the flop to continue to not run into this spot where your hand actually improved at its possible best based on the flop. 

Dont really agree with Xaciddropx, calling the flop is marginal vs this particular player with the reads we had during the tournament, but folding this turn when we spike the nut flushdraw i dont think is a possibility, i think any other turn card that isnt a diamond of a K i think we can easily laydown this hand, still weird that he didnt size the turn to shove less or pot OTR, but easy river fold.

I think river is a fold, rest is fine.

I do agree with sizing bigger preflop though, think flop sizing is good.