[molotom]

Given that he completed the SB then called a 7x, I think he is a donk who hit the flush but whiffed his turn check/minraise.

It's pretty hard to put him on a bluff, because I can't really think of much that he would call the flop with and then end up bluffing the river with (a pair of aces would try to showdown, and the flush draw got there).