No Arnold had a plan for Arnold..he's an utter prick
Arnold walked away from bodybuilding as a winner in 74, no more tittles to be won, no money to be made there...
He was knocking on Hollywood doors , he got a role in a movie with A list actors and dropped a ton of weight to make the casting.
At that point he had no reason to be back to the Olympia stage.
On the other hand you had Butler/Gaines and the
Pumping Iron crew, they had to offer Arnold a solid reason to do the show one more time or they were risking the documentary to be as successful as the book with the likes of Corney Zane Columbu.
WooooSSHHHHHHHHHHHHh All goes back to Arnold