No... according to Jim they are wizards. you are not a wizard if you are a one trick pony.
It was worded quite differently in the quotes above... A sorcerer is pretty much the same category as one trick pony, Look at Aristides too. Saint conveys the method of use, not the quality of ingredients to begin.
We don't know how, or why this happened.. We don't know if it backfired either... It may not have started off as a curse. The original Loup Garou may have had full control of it's faculties and have been an incredible warrior. Who's word do we have about the Loup? Chauncy, a demon. Not exactly the most reliable source.
Plus, every 'feeds on bloodline curse we know of, is cast by using the thaumaturgical connection to said family to pull in them as a source of power anyway... So how do we know he didn't contain the beast by binding it to his own blood, curse thereby empowered by said connection too? Perhaps what the Loup was a manifestation of was more dangerous without a stable host? Certainly the Loup was one of the more frighteningly powerful beings we've come across, because it could violate free will without direct repercussion as it was simultaneously Macfinn and the Beast.
I'm starting to assume in my grand unified theory that the Loup, as a manifestation of fearbringer, couldn't be directly countered by Uriel/old fireman, but since the magical aura blended off into Dresden to cause his depressive state he could find purchase to act to enable his own champion via push in the other direction....