So let me get this straight

Only if Jose Sulaiman wants it to work that way.

Someone told me that the winner of Mosley-Cotto would be the mandatory for the winner of Mayweather/Hatton, is that how the interim champion status works?

it wont be the first time that a sanctioning body has picked up fees from the champion and interim champion

Not sure, Mosley might be the WBC champion and Floyd is the WBC ultra-mega-champion. I can't see the WBC giving up those sanctioning fees for the Cotto Mosley gig.

And the only tittle for Hatton-Mayweather is Mayweather WBC Tittle

So now that Floyd is fighting Ricky Hatton at 147 or we could assume that and since Shane won the interim WBC title that Floyd gave uo to fight Oscar. So the only belt that will be on the line for Cotto-Mosley is the WBA Title. yes sir!!!!!!!!!!!!!!!!!