Mordred is a literal clone of Saber and therefore is female, though draw attention to that and she'll probably cave your face in given her immensely screwed up upbringing. ^^;

As for the whole legends thing, it's... not like that at all? I think that's a far too literal way to interpret this. Similar events happen in history all the time. With swords, it's easy to say they were(possibly deliberately) connected to one another, as some weapons in the Nasuverse are described as prototypes for the later ones.

I don't think it would be noticed unless brought up directly, and even then it's just similar events rather then... I don't even know what you're suggesting.