I fail to see why evil dom Kane has any reason to rebel. Sure, he was wrongfully imprisoned by the Karlssons but that ordeal turned out to be a blessing in disguise. He got access to women, cars and mansions. He grew up poor but now through the Karlssons, he has managed to transform his life. Moreover, the Karlsson women have been nothing but nice to dom Kane. Good dom Kane might still want to rebel to change the Karlsson system why would evil Kane try to change a system that has only been beneficial to him?
Sub Kane has a much stronger reason to rebel given he has faced the perils of the system firsthand
You are again not getting the point, Evil Dom Kane does not need to change the system. His Aim is to rule the same system created by the karlssons. But not with the karlssons as equal or under the karlssons as a employee. Why? Because he is evil and he is dominant. Plain and Simple.
Anyone with common sense can expect that a evil dominant's main purpose is nothing but dominant to something in a evil way, and according to this game, that something is none other than karlssons. And why revenge? Because Kane gets wrongfully trapped and beaten in prison. If he is enjoying everything given by karlssons, why would he kill the rob (the one who attacked on seth). Why the game has opened a new path called Demon at the very moment? Why not he just think like "Why I have to kill this man? Due to him and those invisible "karlssons", I got luxury and sex." But no, He killed that man and also sensed that someone higher authorities trapped him. But he is silent because he is looking for the right time and right rank.
He is not a good or netural person to work with them or to give them redemption and change them into good submissive women. That stuff is for Good Dominant path. In evil dom, he is there to takeover and become (may be) alexander or something even worse.
Even if I think this all nothing matters and only agree with you.. Then, remember that you can even play sub to dom path. Yes, it is more hard to get higher rank in this way. But, according to your reason of why sub is right for revenge, this sub to dom path is also viable for revenge. So, that's give more reason to him to become evil dom in future.
But.. As I said this again and again, no matter what we argue or discuss.. Entities like Patreon, Collectiveshout and mainly, Tess herself doomed this revenge path and it is not longer viable.