Lament Doesn't have Dracula at all, it has the man that becomes Dracula.... within the 382 years between the end of LoI and the start of Cv:III.
arguably the focus of Lament wasn't Dracula, but the Vampire Killer itself, Throughout the game you learn that Mathias was a great alchemist who obtained the Crimson Stone and cursed God for letting his beloved die of Illness.
The Epilogue of the game, much like Lords of Shadow, reveals that the subject character is Dracula.
Aria of Sorrow, I'll take that one back, you are in Castle that is trying to invoke it's master...
Dawn of Sorrow on the other hand really shouldn't of existed... Soma could go Drac but not if you equip the right stuff... and the whole Dark Candidates thing really didn't have enough credible back-story to be buy-able... but it was fun though....
now back to a Lords of Shadow Prequel, the story would go down like this;
You play as the founding members of the Brotherhood of light and follow them as their fall as Lord of Shadow....
Plot will follow the skirmishes of their dark forms to set the conditions of LoS1, thus betraying the brotherhood and sabotaging a certain Belmont.
Carmilla goes to the castle, Zobek initates Dracula + Belmont, the 3 Basic staples of the series.