Hero has been at the table for an hour. Mostly loose/passive table with several face-up regs. Edit: The table in general has been folding to aggression pre and post-flop. One bad $2/5 reg has moved to our table and is trying to drive the action but is just spewing.

Hero has a tight image due to a hyper-aggressive guy on his right opening a ton and hero having napkins to play for an hour. Has taken down a few small pots by value betting and not having to show down.

Hero is the SB with $300. OTTH!

Tight/Passive OMC limps UTG ($140). Range is broadways and pocket pairs up to JJ.

Bad $2/5 reg raises to $5 next in. He is ******ed.

Three tight/passive regs call in succession (last one being in MP2). They can all be pretty wide - no premiums, ranging them on suited cards, connectors, small pocket pairs, weak broadways.

Folds to Hero who looks down at A5 in the SB and raises to $35. Rationale is we have a tight image, an ace blocker, and 15bb of dead money in the pot.

Tight OMC calls, the field folds.

Flop ($110) 985

Hero bets $50. Villain ships for $105 total. Hero calls.

Thoughts?

What does this mean? How is it significant?

It's less likely someone else has an ace.

If a tight passive OMC ships it how can you call? If that player is capable of having two overs here I don't think tight passive OMC is the correct label

Personally, I am just pitching this pre. 5 people have voluntarily put money in the pot and you have terrible position. I try not to isolate/squeeze light after 3 VPIPs because at 1/2 people just call too often. *MAYBE* if you were the button I could get behind this, but it seems extremely marginal from the SB, like over the extremely longterm there may be a few sklanksy bucks up for grabs but not worth the trouble.

That said, I think it's pretty likely you ran into a set here. Easy fold from my computer, in game I'm not sure maybe I call it off as a hero call but I doubt it.