You see this is where it gets complicated. What is Roddenberry vision when he has so many visions throughout the years? The Cage Pilot which was unreleased to 1986 is very different than The Original Series, NBC did not like it and thus they reworked Star Trek with new Characters (for example no Kirk), recasting, etc.
Is it Roddenberry vision when he did not direct the episodes? After all film and tv are collaborative by their very nature.
And Roddenberry stepped back in Season 3 due to the budget cuts and new time slot (due to lower ratings) he was angry for he blamed NBC for almost killing the show in Season 2.