Kizaru is not that fast,just becuase he manipulates light he cannot be as fast as the sun LOL,the more energy you release with sun the faster you are,here the example :
Sun light is very fast,but star lights(other stars have more mass ,and they're bigger and since they have more mass they're more op and the sun light is way faster).
Same goes for Fujitora,his gravity isn't at blackhole leve(he can't trap light)otherwise if Fujitora's gravity was on Blackhole level then Fujitora>Berus from DBZ
That's why there is a powerlevel scale in OP