And who exactly did Monica need to clear the name with, especially since the press named her and Captain America agreed it was a fitting name? Remember, Carol at this time was Binary. She was not even remotely concerned about Mar-Vell's legacy. Further, Mar-Vell didn't have any children then. Very few people knew about his widow, Elysius, and in any event, Captain was his rank, Mar-Vell was his name. Captain Marvel was just a Terran bastardization of the two.
Last I checked, if President Trump dies and I decide to name my child President Trump, I don't need to clear it with the Donald's widow or family first for any reason whatsoever. My child's mother might have something to say about it, but the name is fair game.
As I see it, the Ultimates would face existential threats that would compel even villains to join up. That said, Midnight Son is not a villain. He's occasionally a mercenary for hire, but at last check he is on good terms with both Shang Chi (he helped resurrect Leiko Wu) and Silver Surfer.
As for Graviton, even though his powers wouldn't be unique to the team (Adam can also manipulate gravitons, as it is its own antiparticle), but Hall is a specialist in the field without equal. It wouldn't take much to make him a hero in the short term. They say power is to blame for his corrupt behavior, but a brain tumor can do the exact same thing. What if his gravity powers resulted in extradimensional mass forming in his brain, and that's why he constantly shifts between criminality and megalomania? Sounds like the kind of problem the Ultimates can solve, for which Hall would be tremendously grateful.
Yep, I just heard that Proudstar will be coming back in some shape or form like Bucky. Not surprised.
My point was that I'd want the writers of a hypothetical Ultimates series to bring new creative energy to the roster. They wouldn't need to follow my exact recommendations to the letter. Marvel's cupboards are fully stocked with characters that haven't seen the light of day in ages. Forgotten characters are just as good as new creations. Take Jade the mystical Firebird entity from Deadly Hands of Kung Fu #19 (1975). I could create a new OC, or I could bring her mythos into the present age with some light tweaking. The only difference is on the business side of it, but I don't imagine Disney/Marvel would need to further compensate Bill Mantlo or George Pérez for creating Jade, unless she somehow wound up in the MCU.