We'll have to disagree because I don't believe Frank Gore should be in the HOF either.
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I'm not saying the 1,000 yard receiving seasons are easy to do, but if you are never thought of as one of the very few best at your position for at least a three year period, I don't think you should be getting in. He'll have the career numbers, but he wasn't as ELITE as others during their prime and peak. With the HOF, that should matter more than compiling a lot of stats over the course of a career. And, when I say compiling a lot of stats, I don't think Mike Evans is the typical case of an average player that compiles numbers. He has been an EXCELLENT player, but I don't believe he's at the HOF level.
Frank Gore should not get in. I don't care that he's third in career rushing yards. That's great he played for a long time, but I can name at least ten HB's that were better than him during his career. Many lasted far shorter than he did, but if you can name ten players better at your own position during the time you played, you shouldn't be getting in.
Edit: You seem to put a higher value on the length of career with very good numbers than I do. I value peak and prime more. Just a difference of opinion.