User blog comment:Skeith9/Heroic Spirits Speculation/@comment-25119196-20140629111230/@comment-5739199-20140629173938

You see, if everyone were as powerful as in the legends, the whole city would be destroyed. The Servants are all in the same league, so a human with no skills (Kojirou) is powerful enough to match a holy sword as Excalibur.

The only one who is allowed to be uber powerful is Gilgamesh, because Nasu loves him. But then, even Gil loses to Shirou lol.