[DanZ]

Hero has represented a hand of some sort, and so has UTG AND UTG+1. It's only partially a matter of whether or not UTG+1 would raise without a FH, it's would UTG bet with less that A of flush, AND would UTG+1 raise with the ace of flush AND are these the hands they both hold. BTW, I think it's almost impossible for UTG+1 to raise here with the ace of flush, unless he has a royal.

Add to this the following:

the only way we beat UTG+1 is if he holds the Ad. If he holds the Ad, he cannont expect the button to bet for him on the turn, so he will usually bet. This does not necessarily apply to UTG, who has 2 players left to act behind him, and who might force out UTG+1 with a bet when he is drawing near dead.

This is a 5+ way parlay on the river, indicating the odds are not there to call. There are possible (barely plausible) scenarios where your hand is good, but it's nowhere near 1 in 7.

Dan Z.