Very peculiar to me, there has to be some sort of standardization, which is why sedans are typicaly the 0, wagons the 1, coupes the 2 and vert the 3. At least, recently they seem to follow that trend. I would love to get some more inside information on this, but that does explain some of the irregularities. I wonder what their original G chassis M5 was going to be, I guess it turned out like a turd or they are saving it for the LCI or beyond.