How many senior RAF officers had a hand in selecting the winners of the MFTS contract or offering advice to influence the selection? - the RAF can't wash it's hands of the mess that RW MFTS has turned into.
Yes, you can point the finger at the contractor as well, their whole plan was a pipe-dream in terms on numbers of aircraft, planning and utilisation of same and the ability to cliff-edge the transition from one contractor to another.
Trying to just rest the blame on a Mil-Spec is avoiding the ocean-going disaster caused by ambitious contractors and senior officers plus the Treasury pushing for the cheapest solution.