. But if they grays are just gonna appear, be gods, then disappear with no further exploration I am going to be terribly disappointed.
The storyline is intensely personal, not as lighthearted as the usual. Only the one about the suicide of a major character's father was more intense.
There were humorous aspects, the key, the nerfgun of black ice countermeasures, and for that matter, the Grey Eminence's side remarks.
It was also a really good way of dropping rather more weighty hints about how a post singularity world works. Yes, there are the Great AIs. They have different concerns from humanity as a whole. They're not ominipotent nor omniscient though, they know it, and are deeply introspective and self critical. Somehow, despite having godlike powers, they have inherited from their creators some of our best traits, rathdr than worst ones. Power tends to corrupt; Absolute power corrupts absolutely. They have avoided that tendency, even if it means not intervening in real injustices like the way the penal system treats parolees.
All explained, or inferred, unsubtly hinted at, by this one story. From a narrative viewpoint, the reason why Bubbles had to be in such a terrible situation was to reveal more about the Greys as you put it. Rather than them being a Deus Ex Machina, a way of getting out of a painted in corner, the whole plot was about world exposition, and to show why they don't appear every day, yet provide an excuse for them intervening now.
At the end of which we have the beginning of a new chapter, the next step of Bubbles healing, and if we're lucky, something to make the life of AIs who live amongst humanity a bit kinder. At least 3 intertwined stories, 4 if you include the continued healing of the pugnacious peach.
Consider how much has been revealed about the QCverse by May's story. Robot Jail.