That's the thing people don't understand about the wrestling business......yes, they are entertainers, but some of them (a very small amount) are legit tough guys. They train hard for years to put on a show for people, so why should Savile just walk in and take over?
You've obviously heard of Hulk Hogan, The Rock, Stone Cold Steve Austin, John Cena etc (all in films).......they are all athletes, bodybuilders with great physiques, marketable, who can wrestle a bit, and act a bit. And obviously capable of taking a bump or two.
Then there's the real tough guys......who nobody should fuck with. And then there's Haku/Meng/King Tonga (who's the The Rock's uncle) who not even the real tough guys would dare fuck with. Back in the 80's he was the tag team partner of Andre the Giant, and even Andre was terrified of him.
When he was in WCW they didn't really have any particular role for him to fill for many years, but they kept him on regardless because the Management were too scared to terminate his contract.