The thing is none of the origins are actually bound to their starting classes storywise.
In fact you could argue some make more sense multiclassed or as diffrent classes entirely then not.
Gale is in a weird spot. He shouldn't even be able to be a wizard anymore. Maybe the tadpoles shadowmagic gives him a connection to the shadoweave? But lorewise he should be restricted to just the illusion and necromancy schools really.
Shadowheart doesn't behave like a cleric, much less a Sharan one.
She should be able to commne with shar, especially so near an area saturated with shar magic. Instead of spending her nights peforming ritual murder and praying to shar though she goes on dates and is just generally way to lo nice. Add in Shadowhearts random spontaneous magic and she's probably not a cleric of shar at all, she just thinks she is.
From what we have seen of new wyll mizzora is more of the tradional evil devil tormenting him now, if you take wyll on a good path trying to get out from under mizora's thumb he should be reclassesed almost immediately as a patron wouldent be giving power to a failure trying to break away from their controll
