He's a damned good one, but his agent made the spurious claim that Bell has more yards from scrimmage than any back in history after his first five seasons. This is patently false, and even if you want to give him the benefit of the doubt and say he was talking about per game averages, he expounded by saying that what Bell has done is even more impressive considering how many games he's missed.
So clearly he wasn't talking about averages, he was fibbing. Furthermore, this prevailing notion that Bell is redefining the position by playing three downs and being a multi-purpose back is laughable. Take a look at total yards from scrimmage and TDs for several greats after five years. All of these guys were three down backs. It's been a thing for like, forever.
(I compiled this manually, please let me know of any glaring omissions)
9753 yards, 80 TD -- LaDainian Tomlinson
9301 yards, 63 TD -- Eric Dickerson
8982 yards, 51 TD -- Thurman Thomas
8759 yards, 75 TD -- Emmitt Smith
8546 yards, 48 TD -- Chris Johnson
8350 yards, 63 TD -- Walter Payton
8321 yards, 50 TD -- Eddie George
8288 yards, 60 TD -- Barry Sanders
8154 yards, 64 TD -- Marcus Allen
8191 yards, 52 TD -- Edgerrin James
8160 yards, 45 TD -- Ricky Williams
8124 yards, 51 TD -- Marshall Faulk
8064 yards, 51 TD -- Curtis Martin
8061 yards, 67 TD -- Adrian Peterson
7996 yards, 42 TD -- Le'Veon Bell
That's 13 guys ahead of him by my count. Then there were several within a few hundred yards. To hear his agent tell it, Bell should be lapping the field.
7884 yards, 46 TD -- Tony Dorsett
7852 yards, 58 TD -- Ricky Watters
7831 yards, 63 TD -- Terrell Davis
7758 yards, 37 TD -- Ottis Anderson
7752 yards, 56 TD -- Clinton Portis
7652 yards, 35 TD -- Matt Forte
7600 yards, 49 TD -- LeSean McCoy
7509 yards, 63 TD -- Jim Brown
7470 yards, 57 TD -- Earl Campbell
7392 yards, 39 TD -- Frank Gore
7322 yards, 40 TD -- Corey Dillon
7303 yards, 48 TD -- Roger Craig
7256 yards, 44 TD -- Steven Jackson
7246 yards, 72 TD -- Shaun Alexander