Giz, if you "don't particularly care" about people's opinions, then you have no excuse (or right, for that matter) to criticize them and incite arguments.
With nothing objective left to discuss in an argument I didn't particularly care about in the first place, that leaves only subjective feelings on our behalfs. I feel it is better the way it is, Nagumo feels otherwise, and I am completely apathetic to Nagumo's opinion
as an opinion. I disagree, but with no objective basis I feel no need to debate it further.
Not to mention the whole "what does it matter, it isn't canon and most likely never will be, etc." thing. If it does become canon someday, I may care; until then though I can't say I do.
The only reason Circle of the Moon and Castlevania 64 do "not work" within the rest of the story is because they conflict chronologically with Symphony of the Night and Order of Ecclesia.
All of which were made post-Symphony (and were intended as sidestories to begin with) so there is no excuse for conflicting with Symphony of the Night.
there have been five Castlevania games made that IGA was not involved with.
I'm counting seven; unless IGA was involved in the SNES port of Dracula X (I've found nothing saying he was) and the original version of "Chronicles" on the X680000. I've found nothing stating he was though I may be mistaken in this regard~
If IGA's timeline and backstory don't fit with MercurySteam's and Kojima's new vision of Castlevania, they have every right to retcon every one of his games if they think it will help them tell a better story. He certainly had no problem retconning what others who came before him did.
And in the process would be disregarding
every single game made in the Castlevania series thus far, if this were to become its new official face - what with the fact that it isn't connected to anything.