Here is the list of the eleven RBs with the most rushing yards, from the NFL's stats:
Player Team Yds Att Avg TDs Long
Jamal Lewis BAL 2066 387 5.3 14 82
Ahman Green GB 1883 355 5.3 15 98
LaDainian Tomlinson SD 1645 313 5.3 13 73
Deuce McAllister NO 1641 351 4.7 8 76
Clinton Portis DEN 1591 290 5.5 14 65
Fred Taylor JAC 1572 345 4.6 6 62
Stephen Davis CAR 1444 318 4.5 8 40
Shaun Alexander SEA 1435 326 4.4 14 55
Priest Holmes KC 1420 320 4.4 27 31
Ricky Williams MIA 1372 392 3.5 9 45
Travis Henry BUF 1356 331 4.1 10 64
Things that are immediately obvious. Ricky Williams just makes the top ten and Travis Henry just misses the list. Therefore, I won't argue that Travis is a top ten RB, even though he ran part of the season with a rib injury and part with a cracked bone in his lower leg, and missed one game altogether. Splitting carries with Willis McGahee, I doubt he will be a threat to crack the top ten in rushing yards this coming season either.
Ricky Williams ranked tenth in rushing yards. However, he was the worst by far on that list in terms of yards per carry. Granted he was a lot higher on that list, both in rushing yards and yards per carry. No doubt Miami fans will point out issues with the offensive line as a reason for the drop off. I'm sure that had something to do with it too. However, I think Ricky also had a noticeable drop in his own performance, and it remains to be seen whether last season was a fluke or the start of a trend. I would put him where the list from last season puts him, hanging on to tenth place by the skin of his teeth, and needing a better season to avoid slipping off altogether.