JuJu isn't going to run from competition and Prime isn't the kind of coach to just promise a starting job to get a commit.They will both play, probably a lot
Salter looks a bit slight. Running will get you hurt
JuJu came to compete as did Salter. Even if Salter is the starter out of spring practice, even if he is the starter at the start of the season that isn't a guarantee that he will be the starter all season.
It wouldn't shock me if JuJu wins the job in season. If he doesn't he will still play significant time and there won't be a question that he is the future of the position.