You can't have a lot of resteal situation here. 3 villains are <10bb deep and the only one against who we can resteal (19bb deep) is at our left. When we resteal this guy, we'll not have a lot of Fold Equity because he's not going to open as wide as he would do if everyone had >20bb since he is commit if one shortstack resteal.
If we lose, we still have 30k, we are bigger than 3 players and we can push first-in with a good Fold Equity (usually they call too tight)
If everyone (or at least the two guys at our right) was deeper, I would say that marginal +EV call should be avoid because we would have plenty of +EV resteal. But this is not the case here, at this table, with this stacksize.
So I would not fold 55 here.
BB (t38504)
UTG (t12856)
MP (t20148)
Hero (Button) (t41572)
SB (t15562)