I want to say Brown, but TBH my memory of those mid 2000 teams are fading minus the Sparano year we shocked the league with the wildcat.
Remember him sharing the load with Ricky and having a hard time staying healthy. But when healthy he was decent and could truck people.
Lamar was the home run hitter between the two, but he also never got the chance to be a bellcow, for better or worse.
Shared backfield with Bush and Thomas in 12, Thomas and Miller in 13, 14 was former Denver RB, Williams and Miller.
Both could catch the ball as well.