SB is short so he can 3b very wide. Question is should I just flat call that squeeze and invite BTN to play? I was pretty sure he will fold after my 4b...

Good question actually, but no, as with these aces a heads up gradient is +15% and the 3 way gradient is only +14%,

If we had AAJDds then multiplayer gradient is slightly superior to the heads up one.

All hands favour heads up and multiway differently, as with more players it's less about deck ownership but texture owernship aswell.

In the short term we want our gradient to go through all 100bb with the BTN too but that is disillusion . Still I can't blame someone for being inpatient, and int hat case I wouldn't pot but just find a medium sizing where BTN is more likely to be priced in.

Never calling though, as a principle you should be raising your +ev equity preflop in PLO when OOP and can negate post flop positional deficit.

AA46 doesn't have very good connectivity postflop. Raising and taking down the 25bb is likely good enough.