The Ultimates and SHIELD need a flagship... We can't have their characters coming in and making an appearance in Spidey and X-Men every month just so they don't slink back into the shadows. Where will all of those interesting heroes go? Sure, QS and SW could return to the Ultimate X-Men cast which wouldn't be too much of a problem, however, I hardly could imagine Thor on the X-Men. Iron Man, even. We wouldn't wanna see Black Widow hanging around in the Baxter Building, now would we? We can't leave the Ultimates story open ended.