Thread:LucidPigeons/@comment-25008763-20150319022307/@comment-25008763-20150319043833

here's what I think:

Valeyard was designed to be a CM but due to outside complications (such as retcons, new writers with conflicting ideas.. the usual craziness of very long running media) he became more and more forgotten and aspects of his character "bled" into newer incarnations of the Master.

that's why modern Master / Missy is a lot more monstrous than the old one (yet still unable to qualify due to being completely insane (and not in control of actions) ).

the 12th (technically 13th) Doctor's original lack of care and even slight malevolence at first may of been a nod to Valeyard but was (again) likely dropped.. making him more like the first Doctor ("mean" but "good").

so.. I think Valeyard is a concept that originally embodied the idea of "neutral evil" in Who but that concept has died away due to the vast changes in the show.

if a new version of him returns I'd be tempted to say we should make a new page on that version and keep the original as a CM.. (since Who is infamous for changing canon quite frequently by its very nature)

unless the new version, of course, had links to the old (as Master did).. but I doubt any new incarnations of valeyard would want to delve into the original's past (as it conflicts with current lore).