Oh, so Kenken might have his dad this time around. In the original timeline Yuzuki didn't get the fight he got this time around and he also didn't disband his gang. He just left the gang without closure.
I'm actually happy for Kenken, means he got a chance for a proper & secure family.
He'll probably still turn out to be the tyrant if not worse, but it'll be a fulfilling childhood for him.
So in the future timeline before Gaku timeslipped, Ai and Yuzuki were divorced and Yuzuki decided to leave them ? That was sad. All of it because he regretted something about his unfinished business and unsatisfied moment he live in his youth day..