[amoeba]

I'm not sure hero could have realized that a 5X reraise of the initial raise was not enough to get it headsup.

obviously if hero made a bigger reraise we can say that its possible he would have limited the field but its also possible it wouldn't have.

In a standard game typically 3X original raise is enough to get it headsup at least. The fact that hero went to 5x shows that he already knows the calling station nature of the table and adjusted. I'm not sure he could have known he would get called by 3 people.

Its like saying if I raise preflop for 20xBB with AA and get 3 callers, you can't exactly tell me that if I raised for 40x, I would have gotten fewer callers. There is no way to quantify it.