Putting Dracula in a church in a city (was it in St Patrick, NY?) was a great and fresh idea.
I'd be happy to see the real Castlevania show up at some point too.
Also, LoS may had a large panel of non-CV monsters (LotR monsters, etc. - you say it) but it may be because the real castle (Castlevania) and Dracula aren't existing yet. Remember: when Dracula rises, his castle and creatures rise with him. So as long as Gabriel isn't Dracula, CV creatures may be hiding in the dark depths, waiting for the master of evil to show up.