"With my luck manipulation, I can steal the luck of others and transfer it to either myself or my allies. Even as a passive ability, I am luckier than the average person."
Explaining his ability to Ayame and Winston, Kayden demonstrated it by flipping a coin ten times and he chose head all the time. And in those ten coin flips, nine were heads while only one was tails.
That was still Kayden's passive ability of being luckier than the average person. If he had used his luck manipulation to improve his luck, having one hundred coin flips and having it all at heads would just be a minor accomplishment.
From Kayden's estimation, if he managed to bring this superpower back to reality, winning the lottery jackpot prize was no longer a dream!
So in terms of combat, he might not be the strongest among the three of them, but Kayden was surely the luckiest!
As for Winston, the superpower he awakened was Fire And Ice Elemental Bullets.