David had not come over directly with the Guardian, which was within Aiwass's expectations.
The boy was quite sensible and knew what was important. An interrogation of such significance was not something he could attend whenever he wished.
The Guardian had proactively suggested letting "Aleister" meet David because he had confirmed that Aleister Crowley could be their friend. It was only then that he felt reassured about letting David come to see her.
Although Aleister would still be in Avalon, they would not outright expel her—they had, after all, stripped her of the self-proclaimed title "Royal Secret Agent". Regardless of whether Aleister cared about this identity, it was somewhat ungracious of them.
They would not eagerly reinvite her, nor did they have the face to ask Aiwass to call her back.
In other words, while they maintained a friendly relationship, there was also a possibility… this might be their last contact with Aleister.