This topic is just silly. I suspect that someone from the Porter family started this thread.
Without question, Porter was a very good runner. To name just a small number, Bjorklund, Centrowitz, Chapa, Durden, Eyestone, Kardong, Hunt, Kempainen, Lindsay, Macdonald, Sandoval, Nenow, Wells and Meyer were also very good runners.
Rodgers is a legend. Only Shorter and Salazar are in his class.
Ryun, Mills and Virgin (who won 2 World X-C Championships and was much faster than Porter at 10K.) would be the next level of American runners.