currently humans (idk what lvl other races transform) get ssj 5 levels after kaioken is availiable so theres no reason to get kaioken in the first place.
i personaly think this is a progression error as it simply doesnt feel right, i believe transformations should come after mastering kaioken.
And/or kaioken could be changed to be upgradable every 5 levels instead of 10 because who (besides me cos im weird) is going to use kaioken up to lvl 55 then switch to ssj