Re: Logos, logos and some more logos...
In The Cage, during Pike's "Veena as Orion Girl" illusion, the Starfleet officer who was there with him had the traditional Delta, yet you didn't get the impression he was from the Enterprise.
I suppose he could have been, but it wasn't even the same type of uniform the Enterprise crew wore. Only the delta was the same.
Onscreen is canon, books are interesting. Movies change canon, scissors wrap paper...or...something.