The reason we have not seen this in the NFL? Mainly stamina reasons? Why not some sort of hybrid version? You'd think they could be trained for endurance as long as their not 500 pounds? Thoughts.....
Way back in the days, Al Davis looked into hiring Sumo wrestlers to place linemen, but he soon found out that those Sumo dudes made way more back home.
Charles Wang, the former owner of the New York Islanders, was known for his unconventional ideas, including the concept of using sumo wrestlers as hockey goalies.