I don't see how Aldo is going to get a rematch. The UFC clearly don't like him for numerous reasons.
- He isn't a company man. He is notoriously hard to deal with.
- He won't do much media. He won't hype the fights.
- People don't buy PPVs for him. He doesn't make the UFC money.
- They've had over a year of promoting him v Conor. People would be sick of it. They won't do it again. Yet.
- He makes it almost impossible for them to drug test him. He tried to have a tester deported. When they eventually got him to give a sample, he fell and the sample smashed. Ridiculous.
The main thing is that he will not make them money. It's Conor who makes the money and he could make them more money against someone else.
Imagine the money in Cowboy v Conor (not that I personally believe Conor should be anywhere near a lightweight shot).