Sonnen vs Rampage is gonna look a lot like Sonnen vs Wanderlei imo. Sonnen struggles against guys with great submission skills off of their backs, and bigger wrestlers who take him down before he takes them down.
Chael can take down basically anyone with his double leg, and Rampage isn't exactly known for throwing up triangles from his guard. Rampage also isn't gonna be trying to wrestle Chael. Rampage is gonna throw bombs, Chael is gonna duck under and hit a double leg and punch him in the face with his pillow fists for 3 rounds. It will probably be boring, and Rampage will whine after the fight about how he hates fighting wrestlers.
Then Chael will fight Mir and get manhandled.