Flight numbers are arbitrary as all get out, so it's kinda tough to really keep it all in perspective since DM/Innova don't do half numbers, but I think 5/4/0/3 reflects the MD4 well, 5/5/0/2 reflects the MD3 well, and 5/4/0/1.5 reflects the MD2 well. Like most everything you've just gotta throw...