Who says he's going to retire? Why would he retire if he can just cherry pick whoever he wants. Some people are saying that as soon as he fights Stipe, the interim belt disappears and he holds the undisputed belt again (assuming he wins). That would instantly take the pressure off fighting Tom. Tom would just be another contender at that point. He could spend years trying to line up fights with fighters in lower divisions or try to pull legends out of retirement. If those people are correct, he could really jerk everyone around for a couple more years at least and I would be shocked if he didn't given his sociopathic nature.