Edit: Just wanted to update this thread. I was able to purchase mastery on the other variants, but it did not add the module slot as it was supposed to. I had to rebuy the variant I sold (which retained all the XP i had previous to selling) and then I was granted the extra module slot that I was supposed to recieve. Seems like a bug, I hope so...was an expensive test to figure this out
2nd UPDATE: So, to sum things up:
1)If you sell a mech variant that you have elited, it will still count towards your 3 "elite" requirement mechs for obtaining mastery
2)It will retain all XP gained, though it may appear as some disappeared
3)If you obtain mastery on a variant AFTER you have sold one of the other two elite variants, you will not recieve your module slot - This can be solved by re-logging. (or rebuying the variant
This is all based on my own testing and correspondance with MWO support.
Cheers
Edited by Xervitus, 13 November 2012 - 03:03 PM.


















