87s hero call on river

It is not a limp pre, it is a call.
OTF and OTT I think quite standard check calls with your draw.
OTR you missed your draw that you were chasing and villain 3 barrels. Fold.

Your thought process is quite complicated again. You could just check that you have a draw, you have a certain probability of hitting that draw and calculate if you have the odds to make that call. When you miss, you fold.

Now instead of keeping it simple you try to put villain on some particular hands and think that 9x wouldn't bet the turn so you conclude that he is bluffing OTR which is just guessing. What about 2x? What if he happened to call pre with AcJc? Why he couldn't bet a good 9x to protect his hand from draws?

I would not play 87 suited out of position against two villians if I am not the agressor on the hand. I see two ways of playing this hand against two oponents.
The first one is simply fold if either MP or BTN never folds pre-flop against a 3-bet . Your hand is not going to catch the flop too often, by calling you are going to be in bad shape against a lot of is range, position and agression would do the rest.
I would rather squeeze. The call in position of BTN reflects a weak range. By rasing 4 times the initial bet you put him on a dificult situation or at least you are able to narrow his range. The 3-bet try to isolate MP. Also it seems a lot more natural to do a strong continuation bet against one villian once you get your flush draw.

Pre-flop decisions can really affect the outcome of a hand. Villians range has a lot of 9x´s, even 2x´s.

Regarding pre-flop, I do agree with noviembre02. Normally this hand would be a squeeze for me. But higher suited connectors like 89s or T9s I would often call. Some weaker suited connectors I would fold. I didn't mention anything about that preflop call because I don't think it is so big thing. Especially now that the sizings are smaller than 3bb so we get a little bit better price.

quite heroic indeed

Could be a squeeze pre, could be a call, at micros whatever.

As played fold on the river if not on the turn, you seem to be quite the player (as in Casanova), always in love with your latest hand.