He's never bluffing here, people don't try to make others fold boats. People aren't balanced in MTTs here, especially in the storm.
He has KK AA Jx 99% of the time.
I do call flop and turn though, and definitely flat pre unless you have an absurd dynamic.
This is 100% correct. Standard to get to the river from here.
Remember, your hand is really face up so why would he try and bluff you in the worst spot ever? I also doubt he's even thinking that far and that he's looking down at some very pretty cards and hammering the bet button.