Yeah ironically the only guy in my class that almost washed out was the only former airline pilot in the class, and did he let everyone know that day one! My plane this my plane that. They gave us limitations to memorize for day one and when it came to him he started spitting out limitations for the plane he was previously on...I believe he had a target on his back from there on out haha. I don't think someone with no previous 121 time is at THAT much of a disadvantage. Just study and keep your mouth shut, doesn't matter where you come from.