I will make the case that his 1993 performance against the Giants, with the separated shoulder, with the division title on the line, was the single-greatest individual performance, ever.
There may have been better running backs in terms of what they could do when healthy, but the bottom line was Emmitt was tougher, and more durable than they were.
Heck, I still think when he was at UF, Fred Taylor was a better RB than Emmitt, it’s just that the Gators passed the ball at lot more when he was there...but in the NFL, Taylor simply wasn’t nearly as durable.