Rayleigh + Gaban + other crew members were equal to injured by Roger Oden + Kids of Whitebeard crew. according to the manga.
While the Hero Monkey D. Garp fought to the death with Roger. Translation by Puckthegreat.
Also.
And Kaido sees Oden, Shanks, Roger, Whitebeard and Xebec as the top of piracy, as the strongest pirates he knows and the ones Luffy has the potential to reach and surpass. No Rayleigh here and Kaido knows him.
Garp and Sengoku aren't here because he's talking about Luffy's growth as a pirate and Mihawk isn't here because Kaido doesn't know him but Rayleigh doesn't even any excuse.
Garp > Oden > Rayleigh.