As good as that line was, emmitts longevity has to count for something. He was old as dirt, playing behind a barely mediocre line in Arizona, and still playing at a high level.
I do agree to a certain extent though, that if Curtis Martin or Frank Gore played behind that line, that they would have been dominate. Tarell Davis is a good example of this. His line was as good, and he was as dominate as emmitt ever was. The longevity for Emmitt with the championships, and records, it counts for something. Gets him to 4 on my list.
I mean none of the guys that will be named other then Barry played behind a bad o-line.