There appears to be a disparity in our mutual grasp of the English language.
"Every conceivable mission", in normal accepted English parlance, would include any mission capable of being conceived. In fact, the phrase is typically intended to convey the idea of being all-encompassing limited by nothing more than human imagination...not, as you describe, being limited to what an astute observer would consider to be rational or possible.
Whether or not the "heavy lift" mission for a V22 is considered a technically viable possibility by you or any astute individual is irrelevant; it is still a "conceivable mission" and hence the reason for both Lonewolf's and my interpretation of your post as being self-contradictory.