That's just it-- as tangled up as it all seems, all the bad boys seem to be more consumed with themselves than with her. If there was some deep resentment from exbf, surely there would have been signs before now. Traceable signs.
And garage escort doesn't seem to have a dog in the hunt, even (as was hypothesized earlier) if he wanted a night of being more than friends and she rejected him. It still doesn't seem like enough motive.
Despite the drama, despite the tangled connections and possible bad blood from past transgressions, nothing seems powerful enough to make any of the big 3 take dramatic action to intentionally harm her.
Unintentionally harm her--or conceal an accident somehow-- now that's another story...