Wolf man wasn't a part of classic castlevania bosses. It wasn't until Rondo that he
really became a returning boss, up to the point of sprite reuse (not even a boss actually, he was downgraded to a normal enemy in aos).

Now giant bat, that's a different story. Sotn had all 4 classic monsters + Death in inverted castle, and all of them held Drac's relics needed to confront the man himself.