The JDS/Mir match up is an interesting fight. The closest thing we can find to a weakness in JDS's game is his sub defense (im not saying he has poor defense, its just that his only loss comes from a sub). Im willing to bet that Mir spends a ton of time working on his wrestling between now and then, because getting JDS down and subbing him is pretty much his only shot.
Meathead/Roy is gonna be a sick fight as well.
No amount of wrestling is going to help Mir, Carwin a life long wrestler couldn't even come close to getting him down. Mir isn't going to had a sick single into his game any time soon. You do have a point though about JDS' only shown weakness so far has been his sub defense. It will be interesting because we seen that Mir has developed some heart when he recovered in the fight with Nog something he's never done before. And he recovered right into a sub, so I'm interested to see what happens if JDS hurts him and follows him to the ground.