consider he is going to be 31 entering this season and that the last time he had a productive NFL season was 2003... 5 years ago. Can anyone provide an example in which a player had 4 unproductive years and then came back to put up even a single season worthy of a top 25 ranking?
I agree with your conclusion that #25 is way too high. But the reasoning in your last sentence is rather unpersuasive unless you can provide a bunch of examples of former NFL rushing title holders who had four unproductive years largely due to non-football-related issues and then came back, got an opportunity to play, and fared poorly.Ricky Williams 2008 is in a somewhat unique situation. So statistical arguments along the lines of "nobody's been in his situation and succeeded" or "nobody's been in his situation and failed" are not going to be worth much, IMO.
I agree that a lack of previous examples isn't conclusive.However, to begin with, the list of 31 year old RBs who have had productive seasons (depending on one's definition of productive) is not long. And the guys on that list were generally productive players in the years leading up to age 31, with no long term breaks in conditioning/training, coaching/study, and/or game play. IMO it stands to reason that a long period of inactivity and/or unproductivity makes it less likely for a 31 year old RB to succeed.
It would be a more intriguing question if a player like Williams had one or two productive years, then had a 4 year stint like Williams has had, and was returning at age 28 or 29. To do so at age 31 is beyond the point I can reasonably believe he will succeed, at least in fantasy terms. Now, from the Dolphins' perspective, he may succeed in meeting their expectations, which I presume are not particularly high. But I don't think that is the point of our discussion here.
If there were a single example of someone producing in similar conditions, it would at least show it can be done. As of now, we have no conclusive evidence it cannot be done, but we also have no conclusive evidence it can be. That's why I asked.