yes, they made their choice about kevin bein a good guy. that the evil him is in another timeline
In alien force, ultimate alien and omniverse he is a good guy but there fore he could be a monster again
There is an episode in the Original series where Kevin 11,000 and his son Devin turn up against Ben 10,000. Maybe they might show about that part happening in another dimension.
I could see Ben 10,000 telling his story to his younger alternate self one day.
...and show...
...Toepick's power.
no kevin would never do it
even if he did ben would show a mirror in his face while the mask is open