[forshure]

I think a FD is part of his range; however, I dont think it tends to be as large as you think, unless you have a specific read on him. I also think that he may just check behind w/ a flush draw. So the combination of times you have a pair check behind and also the times the FD checks behind makes leading better imo. I dont remember reading in op if you had him noted as bets when checks to but that obv makes it easy. Also if I checked here it is def w/ intention of c/ring.