Even with one having no particular interest in magic except he knows he needs it to qualify for certain roles -- if you can't work wizardry to defend the realm, the rule is you can't ascend above a certain status -- the others will have them. One likes strange stuff, one likes protective and offensive magics, the others need. . . something. The only qualification being that no one of them can specialize in illusions.
The fun question is how long I can leave it hanging before I figure out what would be plot relevant.
Hmm. . . Dora might be interested in transformation magic. Or perhaps curse breaking, either one would fit a possibly plot twist. . . .