Chug
This has become like arguing with the chemtrail freaks.
If you cannot see that an incorrect process, no matter how incorrect it is, for fitting a good piece of kit has no bearing on an accident then you need a tinfoil hat. You are questing for conspiracy.
Personally I think a straight read across from the mk 6 is perfectly reasonable. All bagger pilots at the time were ex mk6 and comfortable with its operation. Apart from its spacky wobble it flies the same too plus generally operated in the vicinity of the ship the same.