Well, for starters he told us right out of the gate that he was patient zero. Then he added some insight into how this role works. I get why this would probably make you think that no wolf would do this. But, J23 plays a fairly cocky style - especially as a wolf - and I do not put it past him to basically openwolf.
Following this most of his posts have been spent defending or attacking his detractors, rather than trying to solve the game. This is the main reason for me because last game he appeared very solvey throughout the game.
Lastly, as I'm demonstrating now, his attacks on AV don't really make sense with a closer look. It's like he's finding any abnormalities in things AV is doing and using that as direct evidence for him being a wolf.