Yeah Kizaru should be the most powerful
you are under the false assumption that Kizaru can do everything at lightspeed when only his attacks were said to be.
the only thing that is underused are his finger lazers. that stuff should be almost infinite range and deadly as hell.
Laws fruit could be exploited to extreme levels. Oda nerfed it massively after the introduction.
shamble a bomb directly infront of an enemy.
gk everyones ass.
personality swap people in key positions.
and so on...