Code Veronica, Revelations and Revelations 2 aren't spin offs for Capcom.
Code Veronica is different from both Revelations 1 and 2 I think. That was a full fledged title that simply didn't have a number on it. Revelations wasn't that. Indeed, you see people (mistakenly) saying CV is the true RE3, but I doubt very many people will say Reveltations is the true RE6 (even if it's a better game).
I think in the OP I should have put smaller/secundary title instead of spin-off to avoid this confusion.