The 86 is a pat in position, but I'm not patting a 9 there and wouldn't even consider a 10.
We can't ever vbet river w a 96 (cant really vbet 86 on river after patting after first draw, but maybe so against this villain). He's only drawing 2 and has 2 draws left. Patting 96 after the first draw is like patting a T7642 in 2-7. It's much easier to make an 8 or a 7 in A-5 than it is to make a 9 or 8 in 2-7, as straights don't matter in A-5.
So if villain has 235xx and we are quick patting hands like 96/T6 after the first draw, not only can "drunk, agro, loose" villain put us in tough spot if he leads river, but good players are really going to pummel us when they know their 23567 is often good enough to lead into our 1
at
at range.