Dave,
One should factor into the equation some other variables as well. The Osprey cannot land adjacent to the "island" on the Amphib Carriers thus they lose the use of that spot(s) unlike the CH-53E which can land on all spots.
The V-22 cannot haul any standard US Military Vehicle internally. (Discounts commerical ATV's) but does have the ability to haul the 120,000 USD special built M-151 jeep derivative that was chucked because of its record of killing Marines and Soldiers in car crashes (mostly rollovers).
Engine changes have to be done on the open flight deck because of height restrictions. Can you imagine the light discipline problems that will incur?
Bell and the DOD procurement folks can dress it up all they wish....but one cannot disguise a pig by putting an evening dress on it.
