Mab can do what she did previously, in Small Favour? On a smaller scale, create a detailed 3D snow map of the entire city BUT I suspect she can only do it whilst snowing and snow is settling everywhere. The snow on the buildings creates the map not the buildings It’s another reason to attack her on the Summer Solstice when she is weakest. That would mean she would have had the technical capacity to fix LC.
Odin definitely is keeping an eye on Chicago, too much is going on there for him not to. He probably has for far longer than we realise and his ability as Kringle to by-pass thresholds also makes him a candidate for fixing LC. His map is indicative of the technical capacity required to fix LC.
LC needed to be gone for BG in the same way it couldn’t be relevant for Changes, Harry needs to be in the middle of both battles. One set away from Chicago, the other not, so LC had to gone by BG, think how much easier Harry would have had it, in luring Ethnui to the lake shore. It won’t be relevant for Mirror Mirror (unless Mirror Harry has built it as well). We know by The Law Harry has rebuilt all of his other tools, and is re-equipping his lab, so LC2 might be next, especially to increase his defences. We might see the re- building process in part and much interrupted in Next Book together with upgrades. Integrating his mothers gem into it would for example allow him to monitor the way points in Chicago which LC never did. Bob was already part of the set-up, but now Bob is internet capable so he can add real time CCTV images and internet data to LC’s output.
Of course Harry finishes it and his next big case is outside of Chicago.