FkCoolers said:

Just go back and tell him you thought about it more and he's right.

Then register for every tourney he ever plays and hope to sit on his left a lot.

Not sure he'll be playing too many more tourneys……

It depends on blind level ninja. Why commit more to the pot than you need to with a mid pair from EP? Does he want to lose the LP 55 on a 2 6 8 board? Does he want to create a large pot for the LP AA on the same flop?

He needs to ask himself what's his objective, he needs to have a plan and this plan will have many scenarios based on the flop texture. In general 2.5x (assuming we're relatively early in the tourney) will give you enough clues based on players ranges whilst also maximising potential gains and minimising potential losses.

There will always be exceptions based on certain situations but I think the above would be the general take.