This is why I really wanted Kaminari to be the traitor, him being a loyal subordinate for AFO and joining U.A. High School as a spy and pretending to be a good guy in order to get along with everybody would have been really cool and imo way better than Aoyama or Hagakure being the traitor.
In fact his reveal as the traitor would have been way more impactful not only to to Class 1-A but even to the readers.
The evil Kaminari that never was.