Quote Originally Posted by Buffalobiian View Post
Gil vs Shirou in FSN? There's no way he would have taken him seriously. Either you meant Gil vs Saber, or you meant UBW instead.
Gil vs Shirou in UBW - Shirou won thanks to three things:
1) he had access to excessive amount of mana(from Rin)
2) He knew how to wield those weapons properly.
3) Gil had limited mana(he had to feed on humans to gain it, grail wasn't keeping him in this world, and mana from Kotomine(if he got any) wasn't enough)
Basically Gilgamesh has grand armory of weapons, but he doesn't know how to wield them - even if Shirou's weapon got destroyed he just projected another one - and thanks to training with Saber/observing Archer he was pretty good with swords.
Plus he is arrogant as fuck - if he used Ea vs Shirou, it would be instakill.