Since MP1 is already all-in there is not point in generating fold equity given that I am probably already behind MP1 who is all-in so inducing a fold from other villains will just make me lose money in the long run.
This is assuredly not the case. Given how shortstacked MP1 is, he should be shoving with any piece of the flop...6x, 7x, A-high no draw, 54. You are in fine shape and a favorite over basically any range and have MP1 crushed.
Your logic here doesn't follow. You want to give yourself better odds by inviting others in...when you massive equity but 9-high? And then shove the turn, after people have put in $37, when you have less fold equity than on the flop before they've put anything in?