Why should all traitor theories be all gritty and serious? I mean, maybe Jirou can be a little insensetive to Kaminari, He blows up, went missing, later found out he was training with a villain and wipe the floor on jirou and 1A. Maybe after a heartfelt apology he can turn back to good. Comedic angles and all.
Hehe I actually can see something like this being played off in the bnha SMASH spin off ! In canon though I’m sure there are some serious consequences for the traitor especially with the casualties + the damage they’ve done to U.A.’s image. Some major redemption arc would be needed to earn the complete forgiveness of 1-A, I think.