And then you end up with Cain/JDS 9, and Cain defends against nobody else. JDS is likely to beat any #1 contender, and Cain is likely to beat all of them, too. Doesn't mean we want to see that fight over and over. Machida is quite possibly the #2 MW on the planet (could be the #1 as he gave Weidman a great fight), but rematches mean more when both fighters have done more in between.
If Vitor beats Weidman I would give whoever wins the Machida/Rockhold fight the TS. Rockhold would have 4 wins since losing to Uber-tor, and Machida never fought him.
But if Weidman wins, Machida would have two fights, and Weidman would have one in between. There are enough contenders at MW that Weidman doesn't need to be making a second loop just yet.