The thing is, at the NFL level everyone's fast and strong. You don't last if you aren't. Vision, ability to see holes and accelerate quickly through them are way more important than raw 4.3-4.4 speed.
At the college level, especially at big schools, they have such a huge advantage in the trenches, their running backs are running through huge holes in the defense so it's tougher to gauge abilities like stated above.
I never even thought about the vision needed to be a running back and seeing holes. I just kinda thought you went for the first hole you see.
Are there slower running backs who have GOAT-tier vision and can be successful? Is sheer strength more valuable than just straight speed.