My guess is he's playing nice because of political shit. After all he is Hell's equivalent of a captain so it stands to reason his fellow kings might be somewhat pissed at him if he causes a war with the Gotei 13.
Also who knows how long he has been a King, after getting that title things probably became a fair bit easier for him. (Or at least came with plenty of perks to make his effort worth while.) So ptsd isn't as much of a factor as it would be otherwise.
Also who knows how long he has been a King, after getting that title things probably became a fair bit easier for him. (Or at least came with plenty of perks to make his effort worth while.) So ptsd isn't as much of a factor as it would be otherwise.