[quote=@VitaVitaAR]
That's something a lot to people seem to get wrong, honestly, going by prior experience.

That heroic spirits are all actually real people in the Nasuverse. For some reason people seem to think they can also be fictional characters(citing Fake Assassin a lot of the time even though he was also a real person in-universe, just not a famous one) sometimes.
[/quote]

Kinda like that. But on the other hand FGO (Apocrypha as well, with Frankenstein's Monster) is making a disservice by bringing characters that are clearly fictional as HSs.

[quote=@Beloss]
[@KoL]<Snipped quote>

You seem to be inventing this rule. People in general recognize patterns very quickly. I dont see why a Heroic Spirit would not be able to sense such similarity, especially when, as you said certain legends imply it. 

If its noted as something that exists for certain legends then a similar trend should be observed in all others when the correct conditions appear. Why would it randomly happen in one case but then not another?

I dont see what being a real vs fictional character has to do with relations between legends. People note such connections in real life all the time, especially between historic figures who grew up under certain circumstances, or were driven by similar causes. 

[@VitaVitaAR] All heroic Spirits so far are implied to have been real people within the Fate world aside from a few notable exceptions. Again I dont see what this has to do with anything I have proposed. 
[/quote]

I meant in as with the Count of Saint Germain, who was said to be Nicholas Flamel (or his wife), among various other people. This open a precedent on Typemoon lore for him to be another individual, not just similarities in legends.