No knock on DH, I do think he's the best Alabama RB in NFL history and a 1st ballot HF. But...
Don Hudson is considered by many as the 2nd best all time WR behind Jerry Rice
John Hannah is still considered by most as the best NFL guard ever
Ozzie Newsom was considered to be the top TE of his day.
And depending on who you ask, and how they rate them, some consider Bart Star as a top 5 QB (5 titles, only NFL QB with 3 consecutive, led NFL in passing all 3 years, citing "ColdHardFootballFacts.com" but unfortunately that article is now behind pay wall)
Obviously these are cross era comparisons, and especially with skill players the debate starts with what everyone considers important first, because that changes the answer.