Gale kinda needs to be a wizard for his story to make sense and Wyll should be a warlock instead of a cleric where he git power from a different source already.
And shadowheart kinda needs to be a cleric of Shar and not the cleric of another deity.
About shadowheart, how much of her is focused about being a cleric other than just a worshipper. I mean, rogues, darkness lurkers, shadows monks, can be Shar's worshippers pretty well?