Gilgamesh as a fighter

https://preview.redd.it/azhskicfy8mf1.jpg?width=1000&format=pjpg&auto=webp&s=ce901aa594fc1249f604689806842d3988f20687

(Art by No0azette)

How well do you think Gilgamesh could've done against a god? Yes he is a demi-god being 2/3's god and 1/3's human he feels like a perfect choice to help save humanity and show his growth no? Instead of having so many Japanese fighters? I am not trying to start an argument, just getting others opinions on this thought process.