People are having a revisionist recalling of why both Kenobi and Yoda went into exile.
Yoda and Kenobi decided they have to face Vader and Sidious. They both failed. Them being the only remaining Jedi went into hiding, but they feared that the Emperor would learn about the twins and that's why they split them up and Obiwan kept an eye on Luke. It wasn't because they had a "plan". The only reason why Obiwan got Luke INVOLVED was because the droids and R2D2 had a message to give to him. So, it was all inadvertent and Luke only went along because the Empire murdered his Aunt and Uncle.
All of it wasn't because they purposely had a plan. Had that been the case, then Obiwan would of secretly trained Luke for 20 years HIMSELF, but did not. He only did so because of the message sent by Leia and realizing then it was time.