SASless is absolutely correct about the MH-53 crew force dislike of moving all helicopter special operations to the Army. The Air Force Chief of Staff agreed to it in 1987 and it finally happened in 2008. A lot of us don't like it, but thats the way it is.
The CV-22 certainly has less cube than the MH-53M, but it really doesn't haul much less (if any) weight due to the increase in empty weight of the 53 over the years. It will be interesting to follow the V-22 variants to see how much weight gain throughout various modifications affects the capability.