River isn't really the main decision I wanted to discuss. I think the flop/turn are more important.

FWIW though unless he's turning sets etc. into bluffs on the river is he not really polarized to AdXd and air (not really sure what air he can have though) with this almost pot size bet. And why would he bet so small on the turn with the nut flush and leave such a bad pot size on the river.