Playing as Jason Vorhees.
That came out of no where, but it works. He's tall, has the same build, doesn't have to say a damn thing in the movie, and just meanders around the set for a while.
At first I was shocked, then a bit angry, then thought rationally about the situation. The role will require little to no acting at all. So, it all works out. It's just strange that the casting department would go out of their way to cast an MMA star. Then again, I guess they have to try everything to breath new life into the dying series.