If thats Phoenix then the X-men win. If thats just Jean Grey then the Avengers slaughter. It would be a tough battle with an average Avengers lineup but in that pic you have Thor, Hyperion and Star Brand who could arguably solo.
Rogue absorbs Bobby, then disperses across the battlefield and absorbs every Avenger. Excluding, perhaps, Carol just because she wouldn't want that ***** in her head again. Game over.
Its not as easy as youre making it sound. Rogue has to get in close and make skin to skin contact to absorb powers. The Avengers team has a lot of high level energy wielders who could take her out from a distance, Captain Marvel, Iron Man, Thor, Hyperion. Ex Nihilo, Manifold, Abyss.
I see you didnt acknowledge your previous error but have swiftly moved the topic along. Nicely done
As for your point about Starbrand, is it a Beyonder hes facing in this battle, or even beings comparable to a Beyonder? Because im quite sure its a bunch of X-men
Rogue can absorb people by touching them even if her skin has turned into some other type of material (ice, water, ...) via power theft. With Iceman's powers it would be almost impossible for the Avengers to avoid getting touched. Thor and Hyperion in particular would get absorbed quite fast.
Heck, she could even absorb Kitty (and Kurt) in addition to Bobby, before going after the Avengers. She could then remain incorporeal while filling the battle field with incorporeal extensions from her body... and then solidify them all. Not only would she instantly absorb all the Avengers but also kill most of them (ice spikes phased into them). (btw, the final panel below is NSFW -- you've been warned)