@katanalauncher: I'm not so sure he's beating Servants since he's only pushing around supersonic speed and many of them are well within hypersonic territory.
At regular stats, Kirei would be outclassed against Gorgon since the mutant has the speed to evade fired bullets (Kirei only does so via aim-dodging) and his telepathy would make it very difficult for the priest to attack Gorgon under normal means. But with Command Spells at his disposal, Kirei is capable of temporarily augmenting his attributes to the level of a Servant meaning he would surpass Gorgon rather easily in stats to dispatch him. With Kirei also being a very competent tactician and having knowledge on his foe for this match, he will know better than to stare into Gorgon's eyes throughout this fight.
Overall, I would lean 70/30 in Kirei's favor due to his adaptability and items he has at his disposal. There's a small chance for Gorgon to get victory if Kirei somehow gets careless, but the chances of this happening here are pretty low.