User blog comment:Valeth/Random Musings - Did Lore Segregation happened on FGO Gacha?/@comment-32751919-20181202034042/@comment-27971189-20181202070638

Yeah, I think so as well.

Like how on Arthur's KotRs, the difference is simply male Mordred and female Merlin which kinda explained why he didn't have dialogue with other Rounds. His version of them most likely counted as same ones thus they have their own share of vague memories.

Well, considering the game progress, it can't be helped. Some changes have to be made.

IIRC, Proto Cu is one of early servants. Imagine if he wasn't available from start, you might stuck with Romulus and Benkei to fight Tesla in London considering how small Lancer roster. LOL.