I saw a post (and now I can’t find it for the life of me) about how painful it’s going to be when Jupiter has to retire from the League of Explores because it’ll be like he’s giving up on finding Rosie and Arj.
But hear me out… I think Jupiter would threaten to quit the League if he heard that they were planning to hire Jack right out of school. Especially if there was an agreement to fast track Jack’s training and let him travel to outer realms as a teenager.
I think Jupiter would give the League an ultimatum: they can have an experienced Witness with plenty of missions under his belt or a teenager who still keeps an eyepatch on him just in case.
Jack would be mad. Jack would be absolutely furious. But angry is better than dead. And if Jupiter had to choose between searching for Rosie and Arj or protecting Jack from a suicide mission, he knows what his sister would want him to do.
Rosie would want Jupiter to protect her baby boy at all costs.