[colgin]

I probably would have C/Rd the flop and led the turn but I guess you are trying to trap MP, which doesn't seem like a bad idea.

If your read is correct that Button is a LAG then I think the river bet is fine (although query why you don't reraise the turn in that case, especially since at that point you still have your OESD to fal back on if you happen to be behind). If he is not, then I check-call.