Regarding Miracle Man, Marvel owns the character completely as I recall.
So they COULD bring him in to the MU, but with all the recent upheavals in the books and in management perhaps the plan has been put aside.
Also there is the question: is he brought in as a new character, or is he shoehorned/retconned into continuity like Sentry, and Blue Marvel?
Please, nobody type the "S" word. Blue Marvel is an underused and a really great character. I would love a mixed team with Adam and Monica, maybe Jean's new team can become Unity team for the X-Men, cosmic team?