'NITRO104' this is what the generale is quoted as having said:
"...Schmidle said the Marines would fly the planes in short takeoff, vertical landing, or STOVL mode just 10 percent of the time, far less often than the 80 percent rate factored into the initial estimates...."
At issue would be the words "of the time". Perhaps one day this will be cleared up. Otherwise we guess. You guess - I guess.