Peterson and Gore, then McCoy and Taylor have a case.
I think that's putting it really negatively. And I know he played long like Emmitt did and piled on the rushing yards, but this is not really fair to Gore. For one, in 2006 he was 3rd in rushing yards with 1695 and 5.4 Y/C. Not only that, he also had 485 yards receiving. The only reason he wasn't All Pro that year is because it was the CAREER HIGH in rushing yards for LT. It was also the career high for rushing yards for Larry Johnson, but that was kinda BS because Johnson was running behind the most dominant line since the Cowboys in the 90's. Roaf is a HOFer. Shields is a HOFer. Wiegmann was a borderline Pro Bowl-caliber center for a good few years, and would finally make a Pro Bowl team 2 years later. Brian Waters was a 6-time Pro Bowler and 2x All Pro. They legitimately could have fielded 4 of their 5 OL starters in the Pro Bowl.
Here's the list of how many times guys have equaled or bested 1695 yards:
Curtis Martin: 1
Adrian Peterson: 1
Walter Payton: 1
Jerome Bettis: 0
LaDainian Tomlinson: 1
Barry Sanders: 1
Tony Dorsett: 0
Gore had 2180 yards from scrimmage, which was also his career high. To not give that its due is wild.
Also, if you cut off his career at age 33 and don't count any of those end years when he had no burst and just pushed the pile forward, he'd still be at 13k yards and 10th all time. He'd still be ahead of HOFers in rushing. He'd be right about where Bus was. He'd still have 3500 yards receiving which is very high for even HOF backs, and he ended up at almost 4k. So we're talking about a career with almost 20,000 yards from scrimmage, which is 6k more than Fred Taylor.