Okay so I was on Instagram and read something that said the reason Adrien can't figure out ladybug's identity it because in the Time Breaker episode Marrinette went back in time and Ladybug was in the same area Marrinette was I thought that's a pretty good reason also I have a spoiler in one episode one villian is Jagged Stone's assistant and also in one scene Adrien is tell Plagg "she just a friend" I'm not sure who he is talking about but these spoiler are TRUE