This is kind of a split from the current line of discussion in the Vlad:Dracula thread that's all the rage these days.
I wanna argue a specific point by Zangetsu, because it made me realize something that is a common thread between everyone who has beaten Dracula canonically.
First, Z's original post.
I'd just like to point out that the Belmonts are the ONLY humans capable of defeating Dracula aside from Shanoa (who needed to use Dominus). If some Belmont also isn't heir to the VK, it's doubtful they're going to be defeating Dracula while not being the strongest Belmont and without the VK (Soleiyu is proof of this and fights with a non-VK whip). We're literally talking about a handful of people in the world who have ever been able to defeat Dracula's incarnations. In additional the battle between Dracula and Richter was taxing enough to leave Richter completely vulnerable enough to Shaft/ Shaft's magic entering his body. Despite Jonathan and Charlotte's age it's doubtful that any of these battles were "easy".
Secondly it took Trevor, Sypha, Alucard and Grant to defeat Dracula in CVIII. That means something, maybe Trevor could have done it by himself, maybe not. Though Mathias lived for nearly 400 years without having faced defeat. Saying yes to lone Trevor would be iffy at best. Given that another 3 form Dracula in DXC was beaten by Richter and Maria (SotN's Prologue being canon) I would say the chances of success would be low.
Finally, it took the Belmont clan with the help of others 1000 years to completely destroy Dracula.
I like his reasoning here, but are we forgetting Hector? He's not a Belmont, yet he was able to defeat Dracula pretty handily (at least as well as any Belmont).
And he's indisputably canon, too. Given that the only weapon we ever see him use in cutscenes is his basic steel sword (which at least according to in game examination has no special properties in and of itself), I think we can say pretty safely that Dracula is at the very least not ALWAYS undefeatable by anyone other than a Belmont. There are conditions in which he can be defeated by those other than Belmont lineage and without using the Vampire Killer.
I admit it doesn't
completely sink Zangetsu's argument yet, but I do feel it dents it a bit.
Let's keep going with this, because if we look carefully, a common string
CAN be found.
Dracula is, above all else, vulnerable to the Vampire Killer. I doubt any of us will dispute that point.
Let's consider the origin of the Vampire Killer. It was created by a vampire (in-progress) and her willing sacrifice. The Vampire Killer, therefore, holds some level of vampiric power. Hector was a Devil Forgemaster, and in Death's own words
"Devil Forgemasters alone are suffused with my Master's magic", which means Hector was carrying some amount of vampiric power as well -- Dracula's own power, in point of fact. Shanoa did Dracula in by using the Dominance Glyph, which was made from "Dracula's essence/remains", which means she was wielding vampiric power, specifically Dracula's, just like Hector did.
I feel that this is more than enough to suggest that Dracula, is in fact, most vulnerable to powers like his own; those of a Vampire, and especially himself. Anyone capable of wielding that kind of power
should be able to defeat Dracula, if only until his next resurrection. Even so, as Zangetsu said in his original post, it took the Belmonts more than a thousand years to figure out a permanent means of ending him as well, so it's not like they were doing it all that much better during that time.