If you mean this one https://forum.smartlydressedgames.com/t/4-0-concept-backgrounds-replacing-skillsets-in-4-0/2078?u=7thscar then I did see it after great hero suggested I do a search. Yours was more about inherent abilities though, and doing away with skillsets as opposed to revamping skillsets to give the characters more contribution to a team (like a medic, a tank, a damage dealer, etc.) in a way that you grow your character from early to late game.
Also, your thread was definately PvP aimed, as in the skillsets gave you power over other players. This hread is definately more PvE and coopartive team related against the zombiews and environment. You see any other similarities?