I guess I'm thinking about the transfer of information to one's self is just as problematic in most time travel stories. Even The Doctor won't read River's journal and they crap all over time travel rules all the time.

My question is:
If the rules of the show are that people can't go to where they've been, that would mean going to the future and meeting your future self. Who then gave Flynn the journal that hasn't been written yet? How can Flynn now keep conversing with and giving information to a person he says will one day be…

Actually, why is Wyatt even trying to spy on Rittenhouse? It's been established that Rittenhouse and the US are pretty much one and the same. So, Wyatt is basically a traitor right?