[Moneyline]

Preflop: I probably check here too, although there is a lot of merit to 3betting if Marcel will raise light preflop, and especially if there's any chance of getting the limpers to fold.

Flop: The check is a little suspicious, but this guy may just be palying passively with KQ or some other hand that missed the flop.

Turn: Easy bet.

River: Keep firing. The terrible players could have anything, and if this guy Marcel is halfway decent he won't have a flush because he would have either bet or check/raised his flopped draw.

I know nothing about how Marcel plays, but I would put him on two overcards. My guess is he raised preflop for value; figured he had no chance of taking down the pot with a continuation bet, but had enough odds to peel closing the action on both the flop and turn; and plans to check/fold the river unimproved.

Just my opinion...