John MatriX82, on 08 December 2013 - 02:36 AM, said:
Hmm no, if he has already mastered other assaults, he only needs to basic three variants, then sell 2 of them and the D-DC can be brought up to mastery. If that's the first assault ever, then yes, he has to get elite level on all of the three to unlock mastery.
This is correct. I was assuming (possibly incorrectly) this was your first assault 'mech OP, but Matrix is right if you've got others!