I don't know, people tend to get more and more passive, haven't seen someone raising or calling an allin with an incomplete flushdraw in a long, long time. In this case I assign him a range of JJ, 99,88, 66, 44 :
Board: 8
6
4
Equity Win Tie
MP2 35.86% 35.32% 0.54% { TsTc }
MP3 64.14% 63.60% 0.54% { JJ, 99-88, 66, 44 }
Even when I add something like Ac9c it doesn't change much but when I add A8o it becomes a coinflip. The problem is that I don't know, but tend to think he won't raise A8 in this spot. I don't think you can help with that question because it should be my job to know how he's playing, since he's my opponent