I think demibar01 fished him self out of the money =)
PRF:his range is weak. cold calling min raise in mp with A9o is... wierd 0_o either raise or fold, you have no fold equity post flop, you have no good hands to folow up unless you hit fullhouse or set on the flop... but that is true for any 2 cards =)
Two6JJ shows hand with a good 7.5bb raise (a bit too big for what he is holding, but than again it's my liking) so has something, and demibar01 ... again with the cold call of 3bet =)
Flop:why check-behind 0_o if you raise you have some fold equity showing maybe a set, some street/strett dro... i dont know something; here you just give your ops J9s-ATs free outs (and he will get them)
Turn:why call. I can agree ion the bet since you got top pair but your op riase PRF and than check-raised you on the turn, he has something BIG.
River: why call shove? you dont beat anything that you did not beat before. if anything your op just got some strange 2 pair.
To your question: I think demibar01 is either new or was just tired =)