I'm not gonna post the 10+ scans where Bigmom,Doffy,Sengoku,Sakazuki,Buggy,Garp and Ivankov all state that WB is the strongest Yonko. Search it up.
Bigmom's opinion should put an end to any debate, she herself is a Yonko and thinks WB>Kaido/Shanks
Marco never sent Kizaru fly. Kizaru was...