Kobold Avenger
Legend
Psionics has had a class of every role back in 3.5e, and chances are that it's probably Bruce Cordell who designed those classes in 3e will be designing them again in 4e.I wouldn't be too shocked if Arcane is the only power source that does get all roles filled (at least by WotC); it's certainly the only one that has had classes for every role in print (the Swordmage preview for LFR covers defender; the Artificer preview in Dragon covers Leader). Divine probably will, but it's easy to see everything else being 'incomplete' in the eyes of those who like to fill out the grid.