The best way imo he could potentially make it happen is through logia awakening. We don’t know what it is yet but I think a cool possibility would be that logia’s essentially make soldiers out of their own elements
Kinda like what cracker can do but with the soldiers being more sentient
That way kizaru can end up fighting everyone. I think it’d be funny if he was able to make a bunch of light monkeys and the other logia admirals make an army of their animal
It’d also lead to the strawhats without haki needing to use light pressure technology to hurt them. The light dragon alien make be able to actually do damage next time we come back to it
As for karasu pretty much having the same exact ability I described… maybe he is awakened
We know each devil fruit type has its own rules as to how they awaken that don’t always tie to power levels. So maybe he did the requirements