I’m over-sensitive to this, but are you trying to say brian westbrook was a third down back? Reggie Bush, ideally, may have been projected to be brian westbrook(or a sightly better brian westbrook), but that wasnt because the league was over valuing third down backs or punt returns— before concussions cut his career short, westbrook had a 2-3 year window where he was probably the second best RB in the league behind LT. In 2007, he might have even been the best. Heck, as early as the eagles 2004 superbowl season, westbrook was arguably their best offensive player.
Darren sproles is probably as close as you can get to a superstar third down back.* Westbrook was more like a slightly worse marshall faulk whose career got cut short because of concussions. In 06, the eagles were under-.500 when mcnabb blew out his knee and, with andy reid putting the burden solely on westbrook, he stepped up and carried a written-off eagles team to 5 or 6 straight wins and a playoff victory over the giants. He was the mvp of a real tough nfc east that year.
I do think youre right that big proponents of reggie bush were at the time comparing him (favorably) to brian westbrook, but that was more because they thought he could someday be a top-tier running back. The proposed ceiling was more brian westbrook-meets gale sayers, not a rich man’s darren sproles.
All that said, bush had a pretty good season in miami this year. Also, with the way the sport has become exponentially more finesse/pass-oriented, maybe he could have a ricky williams-esque career resurgence and prove he’s not a bust. Maybe? I can’t claim to have watched a lot of fins games.
edit: *thinking about this, it’s clear sproles isnt just a “3rd down rb” either. He’s out there on any down, another tool in the impossibly varied pocketknife of the saints offense. That said, I also think that were the saints to have a true #1 RB who could also catch the ball like sproles does— a westbrook, ray rice, marshall faulk, prime LT— you wouldnt see the “rb by committee” thing to the same extent. The point is this: in any other era, on near any other team, Sproles is a (great) third down rb, but still burdened with the weaknesses of a third down rb; yet in this Saint offense, in this new NFL, they can ignore orthodoxy, they can outsmart and out-finesse everybody, and darren sproles can be a #1 running back.