If I'm the big stack on the table - I'm not really concerned about how others are playing - except the CO sb & BB. I'm putting massive pressure on those 3 players if they are short stacked. Honestly - I will make them play for their tourney life - with any marginal hands, J/7 o. Yes I'm telling them - either you play for stacks/life - or those chips are mine. And sometimes I loose the flip, but 50% of the time or more I'm winning, because I'm doing this with ALL hands, premium and marginal holdings.
I called a shove from sb with 9/4 offsuit yesterday and beat A/K. Just how it goes when I have the big stack.
When I'm at a safe stack size 30-40bb but not the chip leader - I'm avoiding all in preflop except with premium holdings. I'm not short stack bullying - I don't need to, and I'm not concerned about busting others out.
When I'm the short stack - well - I play differently than others do - so just keep believing that I have AA and we will be cool.