Are you implying prime Garp and Sengoku are weaker than pre-skip Luffy?Garp and Sengoku fought Shiki ''equal''?
Luffy > Shiki
bring me hell, but my point actualy is we can't say that Garp > Rayleigh...
we havent seen anything from Garp just yet and Rayleigh fought with Kizaru without much effort....