As I said, Aiden and Xavier know each other. For me it means that as a behavioral (and criminal) teenager, Aiden had to attend a course with Xavier. Whether Xavier was corrupted by Aiden remains to be seen. In any case, Aiden is known to the police and I think he has something like "probation". Even if his uncle protects him, he cannot act with Sophia as he would like.I think points 1-3 are definitely interesting, we don't know if he already has the 12 tasks completely defined or as you suggest he already planned to drop them at some point in the story.
For me your point 4 is the most important and interesting, though. So far it *seems* that the motivation is mostly driven by the humiliation of the "power figure" of the teacher, rather than just pure lust. It makes sense given the character background and the context. But I think it would benefit the story to know a little bit more from his background. We had brief hint during the 3rd task when they talked about the "special" program and Xavier but he cut the explanation short.
Knowing a little bit more about the past could help to have a more dynamic arc in this path and even for the character himself. I don't know which narrative device can be used to achieve that, but as I said in a previous post I doubt that there will be so many tasks inside the classroom, as it is a limited environment especially if we want to keep the story "believable". So alternating classroom with out-of-school tasks could be exploited to learn a little bit more about him, his motivations and possibly evolving the character during the tasks.
And here it comes the role of a good writer, if he ever manage to get a good writer to help him that could be one of the (many) aspects worth to better explore.
As far as the commitment of a good writer is concerned, I am skeptical whether this would change anything about the Aiden Route. Maybe the content of the dialogue and a few inner monologues. But I think the Aiden Route in particular is pretty well worked out because this path seems to be a central point for the whole story. A new author wouldn't change that.