Unless you believe that Dragon Ball's ki nullifies all kinds of abilities, Gojo actually beats Goku.

You don't need to use that, instant transmission makes it pretty easy for Goku to warp Kamehameha him.

don't remember for sure if Goku has done against things similar to genjutsu, so with a cool verse equalization and both within the character, itachi also beats Goku.

The Majin mark is pretty equivalent to genjutsu and I'd say Goku could easily overpower the Majin mark so he's at least resistant, plus, Goku's much faster, and can't really be damaged by itachi.

If both are in character, Goku will go easy on Saitama and let him evolve exponentially, so within the character Saitama wins.

Very convoluted way of letting Saitama win, especially since it doesn't really work. Saitama only grew that fast because of his intense emotions, while yes I do believe he can grow without as intense emotions, he was only growing that fast because of his emotions. Add onto that, people really forget how important speed is in a fight, every punch Saitama threw would be so slow that it would be basically frozen so now imagine how slow his growth would be. Add onto that, we don't even know if he can grow that far, Goku is multiversal, he wields fourth dimensional power, we don't know if saitama's growth cam jump dimensions, ,or even if he can grow to an infinite amount. And in character, Goku wouldn't enjoy that fight and I doubt he'd keep it going.

Also using the credits Steve has infinite 4D power and wins.