Don't you think it's overkill? Rooftop 5 is to much for one Admiral, specially now that they are far stronger than on the Rooftop.
Should be a matter of a few clashes and that's it, imo.
Yeah I think that's probably the safest and most sensed prevision.
Again, I don't think it will be a prolonged fight but just a clash or two, like: Aramaki flexing on someone, rest of the alliance being impressed with Aramaki's ability, then 1 or 2 of the top fighters charging at him and maybe landing one blow too. After that, Aramaki could very well shrug it off saying "Well I guess this would be to much" or something like that, immediatly dropping a bomb about the outside events after that.
Zoro/Killer/Sanji are the most fitting imo, cause they would come to protect the Captains who made the lion's job 7 days before. Aramaki could also reveal their bounties as a compliment...