Jin isn't overly involved with Zander. If anything, Zander has been a bit like training wheels for him. Learning how to train, what to feed, why this behavior is good, why it's bad. He's learning and he's studying...but not necessarily involved, if that makes sense.
NextDog will be his, though, and he's hoping to get into SAR, maybe some conformation and some random other dog sports. He's hoping to put most of the foundation work/training on himself, and he seems really excited and he's looking forward to it.
Gotta admit, never really expected him to get this into it. But I'm not complaining.