Buddy, go back and re-read Sabaody.
Rayleigh was fighting for his LIFE trying to hold off KIzaru, who just wanted to complete his mission and kill/capture the SHs.
He even says "I wish I could go there and save them" and then Kizaru mocks him saying that holding him off should be plenty already.
If it weren't for Kuma, Rayleigh's biggest "contribution" to saving the SHs would've amount to absolutely nothing, very similar to the Gaban/Gunko situation here.
Stop this Rayleigh dick riding just to shit on Gaban.
Here Gaban OBLITERATES Sommers and was about to DUNK on Gunko, if it weren't for Colon spilling the beans.