How stupid was this "Interim Title" fight?

 Why have an "interim title" fight when the very next fight is against the real champ.  Same thing happened with Mir vs. Nog.

An interim champ makes sense if the champ is going to be out like a year.  Not some immediate match.

As it was explained at the presser, they weren't sure at the making of this interim fight that Brock could come back anytime soon. After that, Dana didn't want to change things again because of how many changes Carwin has already had to deal with.

What's the big deal?

I was glad that if need be, there would be 5 rounds to decide the winner. Obviously it wasn't necessary but....