JDS is fighting Yvel at 108, Nog is fighting Cain at 110. Therefore Carwin/Mir makes perfect sense. Not a business decision just a scheduling decision. 5 of the 6 fighters could be fighting for the interim belt in theory, all IMO are worthy of the shot and this setup in the next 4 PPV's helps sort out some of the HWs.
So what? It's a title fight and it shouldn't just be based on who's got time that night. In my opinion Mir moved down the pecking order after the loss against Brock and is pretty much the last person to deserve another title match. He looked great in his rebound fight, but a single win over a guy who is also coming off a loss shouldn't earn you a title match.