Another fun concept for Jon is actually Elias’s kid. Jon living with his grandma only she passes away earlier than canon. Which means Jon has now lost another parental figure before he’s even 18, even if she was distant. Luckily she did note in her Will that Jon’s technical father was still alive. Elias never knew so Jonah is blindsided.
So you get Jonah, who did not know about Elias’s indiscretions, getting a post-Mr. Spider trauma Jon dropped off like a gift.
Just little Jon who is already marked and now purely under Jonah’s control? What could possibly go wrong? Not like Jonah would take advantage of that don’t be silly.