That was the undefeated team, yes?
Yes, those Dolphins’ players were part of the undefeated NFL team. The Memphis WFL team was nicknamed the Southmen after relocating from Toronto (Northmen). The team relocated, as I recall, because of political legislation passed in Canada which forbade U.S. football teams from playing there.
As far as the NASL soccer reference, I was making a joke to add to your earlier reference but I think I missed :-)