How can you tell? IP? To me Hus, blue3, GranTurismo, PS3owner and others do not have posting styles that let you tell them apart. Let alone when they are spamming.
Gball's style is to create new hidden accounts and post demeaningly over a long period of time. Hus and Blue3 are the same person (Hus being the original account). I'm not sure if GT is included in that or not, but it doesn't really matter. It takes much less effort for this many mods to ban his accounts (got that last one in 2 minutes, a new record) than it does for him to keep making them.