All the Grand Admirals and their ships escorted Aeneas to Suttergard, it was the best and least compromising option. They couldn't hold multilateral negotiations on a cruiser, and risking moving an artificial intelligence capable of negotiating on behalf of all of their people wasn't the most prudent thing to do, it was better to move to a place that couldn't be used against the humans themselves.
The problem was when Grand Admiral Isis, and the rest of the high-ranking officers present saw Alpha 21, he was the embodiment of every temptation a simple man could resist. The artificial intelligence got off the cruiser as if it were going to a fashion show, or worse, to the runway of a brothel where a new girl was on display. It was unacceptable that those men had been defeated so easily.
