it would’ve been cool if the lords of the castles were Devil Forgemasters.
Cool but kinda nonsensical in-universe. Death states that only two Devil Forgemasters were made (Hector and Isaac), and while the idea of essentially using them as a potential back-in to the world of the living is useful, Death also seems to believe that they'd have to succumb to Dracula's Curse to be a worthy vessel; Hector restrained himself at the last minute, which was why Death had to use Isaac as the backup option. Hector himself transmuted the curse itself into "something small" and "harmless" upon defeating Dracula, meaning there's effectively no curse for a Devil Forgemaster to succumb TO any longer, so that's a means of resurrection that's no longer practical. Further, Dracula learned firsthand that a Devil Forgemaster suffused in and able to transmute and repurpose his powers is a HUGE flight risk after Hector's role in killing him twice. I doubt he would have ever made a Forgemaster ever again, choosing instead to find alternate means to craft generals and invoke cursed legions of darkness.
That being said, I
could see him adapt the process by which Forgemasters were made to another purpose, maybe instilling some of his power in favored monsters to make them stronger and have a lesser form of Dominance over their weaker brethren, serving as leaders.
Bosses, if you will. And perhaps, with some iteration, he figured out how to give them enough to be useful, but not so strong as to be a threat or a hindrance if they betrayed him, and made ENOUGH of them that... perhaps if some well-meaning hero came along and unknowingly freed the fragments of Dracula's power from their mortal coils... it would coalesce into
enough of him to serve as a vessel and a means to ensure his resurrection.
Perhaps.