Kyubey has been suspiciously useless lately, to be honest. In fact, I'm pretty sure he intentionally misdirected us earlier in the day by not specifying which abno he rushed to observe. He might have even known about Kyoko all along, or at least figured it out earlier than us.
It
is suspicious that he leave right when Kyoko was arriving.
However, we will have to confirm it with him after we finish our business with the girls. That is another thing we need to grill him on.
It could have easily been him betraying us by withholding information as easily as it being him just not used to having to deal with something as...intelligent as NT. I do not believe Kyubey would even be aware of it if NT was tricking him with an illusion.
Though one thing is for sure. We should have asked him to observe what kind of abilities NT had. While we did mention to him to observe where it is. Had we known that NT was using the magical girls' abilities, we could have been much more suspicious of NT earlier.
It is a coin flip in this case on whether he didn't mention it because he thought we already know or he withheld information again. And even then the latter could even be done out of habit due to us not asking and not out of malice on his side.
He has answered our questions in their spirit fully in the past when we raise them.
Also the likelihood of it being that Kyubey thinking "Oh, this thing can use MGs' abilities, X was right that it is super dangerous." and then not telling us is again, not low.
As for his usefulness...I mean. Recently, we kinda stopped voting on Kyubey's actions. And the only way to make use of him is to vote for Kyubey's actions.
But thanks for that reminder since I just realized there's another thing we need to do.
From this point on, we should do an abnormality report with Kyubey at the end of every day. Doesn't matter what other ambitions we have. Just have a conversation at the end of the day with him about what he observed and any unusual things he noticed.