He didn't run through a lot of tackles, in fact the #1 thing I used to always bitch about was how easily he was brought down considering his size. He was quite the soft runner, especially when you consider how big he was.
And he dropped multiple easy balls routinely, every year he was here, even when he was healthy...it wasn't an ability or health thing, it was a concentration thing.
You keep trying to boost dude up, but if he was even half what you claim someone woulda drafted him, at least in the last round. Guys with open field speed like him don't go undrafted unless they are seriously lacking in some other areas. His lacking areas were basically everything that makes a great RB, except for blocking, his stiff arm, and his speed... everywhere else he was lacking.