Good fight. I think without Godslayer that Midnight Sun would win about 7/10 against Gamora. He is a great martial artist with class 75 strength. The strength difference may be the difference there. With Godslayer, I'll say Gamora 7/10.
Gamora simply touched Rage in one of the Infinity arc story lines I think it was the Crusade, and knocked him out on his feet. She also went toe to toe with Thanos, which was horribly lop-sided and held her own. i have to with Gamora over the Midnight Sun.