[teajay]

Your raise PF doesn't have to be to get it heads up. You have an equity edge here against 3 opponents and your raise makes money for that reason.

That being said, I don't see why you would check the turn. I wouldn't slow down until I had a reason to, and this certainly isn't one.

You say Button is passive, but is he tight passive or loose passive? If he's loose, value bet the river, otherwise a check may be better.