So married people are no longer dating as the friend zone includes the entire dating zone, but the dating zone does not include the entire friend zone. Also all initial friendship is in the dating zone until the person knows a lot about the other person over a long period of time.
I find this highly questionable as someone would initially be a date, stalker, creeper or acquaintance, but not a friend until you have known them a long time.
If the diagram is true, no one has ever had even one friend that was not a date, stalker or creeper at some time. :roll: