I am late to this thread, but I personally think the "legendary armory" should include any account bound equipment stats. So if I unlock light exotic berserker stats then any light exotic armor can be swapped to berserker gear. Same for ascended of course. Making every combination of ascended gear would take quite a lot still, so bypassing legendaries doesn't seem too problematic. Requiring a base item for other stat swapping could keep the economy sink reasonable (IE I still have to create another ascended light set for each light armor character).
I appreciate this post as well. Flintfoot also seems to offer the conversation option to start the training even though there are active event markers over the fallen trainees/enemies. I would love to finish this up to cross off my mastery points in advance of future releases.