Dont have situation from before allins had happened. But I open raised UTG and HJ, CO and BU call. SB 3bet pot and he had been tight so likely AAxx heavy range. 3bet was to 5.35€ I think. So I called and CO decided to ship it and SB shove. At that point I thought that well I probably have equity to go with. CO had 16€ and SB probably bit below 100bb. Anyway it was like less than 20€ to call for pot of 69€ so should be fine. Versus these exact hands I had 30.6% Though I suppose problem is that CO range is probably not AAxx heavy but no idea what it could be...
HJ had been calling machine (close to vpip 100) but not that much other players. Not sure though if open fold in first place would be better with HJ likely calling which might open this sort huge multiway stuff to happen. Though as said wasnt expecting it that often to happen.

No idea why CO thought shoving that would be good versus very likely AAxx.
I suppose real decision points in this was on open raise and whatever to call big 3bet from SB with possibility that we get more calls behind. Wasnt really expecting 4bet though as it should be mainly just AAxx doing that and CO and BU being shorties should go for 3bet really often with it.