Too weak as bluffcatcher, imo. 9876 can totally play like this and probably will most of the time.

If you're bluff catching, you aren't trying to win against 9876, that hand isn't bluffing...

I agree that it's a bad spot to try and bluff catch. The hand is strong enough, because a better hand that isn't a straight would have enough value to showdown. He's less likely to be on a FD because you have nut draw, and a set isn't likely because he would likely raise the turn with it and most live players don't go for thin value on the river with sets because they believe they can't get value from worse hands and that not enough better hands will pay them off. Straight draws make a lot of sense for a big part of you villain's range in this spot, you aren't blocking the straight that hard if he's a loose player he can have a lot of hands 68 plus pair combos, or 468x, 689x.

That being said, you're blocking J98 combos and you play with the he opponent often. Live play is largely exploitive, if you think on his misses he's betting against you with all his misses on scare cards to exploit your nitty image (lol, AJ93 oop multiway for a pot sized raise��) and he's playing a lot of questionable holdings with lower flush draws, then there could be case.

Again, I think it's a fold blocking/holding the nfd, and on the river you're blocking 2 pairs as well. He played like a straight draw or pair plus straight draw with board that has a fd present and most opponents are gonna show you a straight there too often.