First off, against a very loose player I'm for sure 3 betting this hand and would be very willing to play for stacks with it. I'm imagining this guy is willing to open with probably 30-40% of hands, so you are for sure crushing most of his opening range.
I can understand it being a bit weird calling an allin of $120k with $16.5k in the pot. $6k each, $1.5k SB, $3k ante...I get $16.5k in the pot. I'll add I don't know how much time I'd put into analyzing his play, anyone who would 5bet allin with AJ considering the action is a friggin nut case in my opinion. I'd view this like Veritas, you are beating all but 8 hands. You block A7 and A8 and especially AA. You're crushing probably over 95% of his opening range postflop. I feel like this guy is more likely to flip over J 9 off than a hand that beats you. As played, I'm for sure calling.
__________________
|