Slogra and Gaibon are clearly the Scratch and Grounder to Dracula's Robotnik
This comment, goddamn. I hate it, but I love it, too.
On a more serious note, I do believe that the bosses in the games generally (no pun intended) have some form of authority over some areas, at Dracula's pleasure, of course. This is outright stated with some characters to be the case, like with Orlok. However, more monstrous bosses are more likely placed as guardians, rather than generals, like Beelzebub or Legion.