There were two reasons that did come out.
One was that Bill thought Stephen Jackson was an upright type runner and he did not like that kind of runner.
The other was that some heard that Bill did not like who Steven Jackson's agent was at the time.
Don't know if those are true but that was the rumors after the draft.
I think what happened was They had a a debate about the three available backs, jackson, kevin jones and julius jones. If I remember correctly Offensive Coordinator Maurice Carthon had them rated all pretty closely and then the big thing was getting the first round pick from cleveland. So they could take jackson or they could move back and get an extra 1 for 05 and still a good running back amongst Jones, Jones and tatum bell.
Turned out to be a great thing because 04 was doomed no matter who the running back was. Quincy was cut, woodson retired with the back injury and then terry glenn and many others ended up on IR early in the season. 04 was just painful.