You're not crazy, he's changed from a shoddy evoker to a rather good one.

almost. he went from shoddy invocator to shoddy invocator with quite the ammopack, to shoddy evocator on steroids (hellfire), to somewhat skilled evocator without steroids but with aimbot (exchange hellfire for soulfire), to skilled evocator with aimbot (training Molly), to nothing (ghost), to very skilled again with aimbot (Mab's training plan, and retaining the soulfire) and yet again increased ammo (WK mantle). what I want to know is:

"Will the event of harry invoking his own name  to use against the outsider signify an increase, or realization thereof, of power for Harry?"

that's all. it really struck me as odd when it happened and even though it wasn't mentioned again, it seemed significant.