I would have to agree Sean. I also point to the fact that Universal considered having Count Alucard appear alongside Dracula in the first concept for A&C Meet Franky, which tells me they considered him a seperate character, like Dracula's daughter.
I don't buy into the reboot theory because there is diologue that links Son of Dracula to the original.
To the original 1931 movie with Lugosi? Wanna give us an example? There's plenty that links it to Bram Stoker's novel, but I don't remember any dialog that comes close to linking it to Lugosi's version.
When the doctor from Transylvania talks about the legends of his land I get the feeling of it being at least loosely connected to the Lugosi original.
Dr. Lazlo's discussion of vampire lore could apply to almost any vampire movie of that period...or even today. It didn't provide any direct link to the 1931 "Dracula" any more than it provided a direct link to "Twilight."