Ian Aloser - I don't follow your train of thoght that east is now north. Can you please elaborate? (If not successful, that is, then Mandle will do it for us.) 
I'll probably regret not sending squads to every Bay-area on the map, but...if Bushwick is back to Basic, that one may be the A in the matrix. Glendale could mark the G to the east. So...what if the alphabet paths points to areas to the northeast and southwest of Bushwick?
Because the killer mentions "memories", I'd like to (potential solution) send squads to the Brooklyn Museum and the Queens Museum.

I'll probably regret not sending squads to every Bay-area on the map, but...if Bushwick is back to Basic, that one may be the A in the matrix. Glendale could mark the G to the east. So...what if the alphabet paths points to areas to the northeast and southwest of Bushwick?
Because the killer mentions "memories", I'd like to (potential solution) send squads to the Brooklyn Museum and the Queens Museum.