With all due respect to Mike, his diving with GW's has taken place in conditions that have been hand selected to be near perfect, days that come around once in a blue moon.
Chatting to the GW operators, and looking at pattern of attacks etc etc, most people will agree that the only predictable thing about a GW is that it is totally un-predictable.
people watch, film, note and eventually say that this and that is what the GW does or does'nt do, the only problem is, nobody tells the GW, and he just changes all the rules>
Dive with max caution, and then some, and if there may be a white in the area, do'nt expect anything, or try to predict anything, ever.
Jeff