Teams: Portugal, SL Benfica, Manchester United
How is that for sure? Perhaps, in regards to sheer size, the Cowboys of the 90s. They had the biggest OL/DL I've ever seen. However, the league is much more competitive now considering the new rules. The only rule I can think of that gives this generation an advantage is that buffer zone between the WR and Secondary which was non-existent in the past. Defenses are now smarter and have people playing in the secondary the size of LBs, but still retaining speed.
I don't see how you can argue that they are not the most dominant team in history, at least so far. Before this game, they had been beating their opponents on average by 30 points. Tom Brady is projected to throw 61 TDs this season which is incredible. If they win it all, you have to at least throw them in the running with best all-time.