Everything about the age up doesn't feels right and this screams editorial mandate by upper management for a new legacy hero to fill the diversified legacy characters.
I wish Jon got a proper development without just kidnapping him in Earth-3 and suddenly age up his entire childhood have been robbed in this rushed and hotshot writing because Bendis wasn't the proper writer to do it in a good executive way.
Honestly Conner was more ready than Jon or maybe Kenan Kong but he's being forgotten nowadays.