My take on it was this.
The UTG limper HAS to have a monster, THAT can be the only reason he didn"t move all-in. And he is OBVIOUSLY calling.
The other all-in move is standard and I am probably ahead of him so against those two, I am prepared to call.
When the big-stack shoves, he either has a medium pair or a monster. Either way, I am in a dilemna as he can bust me.
If he busts all 3 of us, then I would finish 7th as I have more chips at the start of the hand. If I pass, I can ladder and pick a better spot to get my chips in.
I feel that if I call, I have little chance of a favourable outcome as unless the board is 10-high, I am likely behind.
Despite my lack of history against this big-stack, I decide that he ISN"T weak and that I will find a better spot.... and I pass.
The outcome of the hand follows next.