I wasn't thinking of it as being terribly close to the Museum--just located somewhere along the route between the MoNA and wherever Team Awful is going.
(Though now that I think about it, it's not terribly implausible for the market to have been located close to the museum. The quartet there might have guaranteed some modicum of security in exchange for having a stable source of fruits, meats, and vegetables on hand, like every other successful gang of vicious warlords in history. It wouldn't be ideal but hey, few things in the Reckonerverse are. A lot of Epics are murderous, but only the absolute dumbest will kill all the food suppliers in their area and repeatedly force themselves to move lairs into more agricultural areas.)
Back on track, I won't have them appear if you find it implausible. I just like weaving character posts together as much as humanly possible.