Leon would give Jerry fits for 4 rounds, afterwards Quarry tears Spinks apart en route to the eighth round tko.
I think the most likely scenerio is Spinks would go into defensively mode early, allowing him to go the first 3 or 4 rounds unharmed But Jerry would catch up and start land those hard lefts to the body and head, and zeroing in those smashing rights, I predict a stoppage around the 7th or 8th
I like Leon,,,,,,,,,,,,,,,,,,but got to go with Jerry Quarry in 2 Rounds. Can see the left hook coming from a mile away, and nailing Leon.