Changes - Water Street Parking Lot

Although paintovers are a normal part of a busy graffiti site, returning to the parking lot a day after my previous trip, I was surprised to find new areas painted over what had been there the day previously. A week or so l;ater there was more new paining. All the new stuff has been at the south end of the eastern wall - not over the fancier pieces elsewhere. Is there some sort of pecking order at work, or are some artists bigger than others, and enforce their territory more vigourously? I'm not sure, but here are the changes for your perusal.

Panel Three
______________________March 3 2007
______________________March 4 2007

Panel Two
______________________March 3 2007

______________________March 4 2007

______________________March 18 2007