I only saw him mentioned once, but Sandor Iharos gets my vote (although I'm sure a distressing number of posters have never heard of him). He set 6 world records (1,500, 3,000, 2-mile, 5,000 & 10,000), showing incredible range, but missed the Melbourne Games and was past his peak in Rome (11th in the 10,000). Only Rono matches his credentials among the non-medallists.