I agree with you and think he deserves to be in.
My comment is more observation on how it has went in the past. They tend to discard somebody unless they are near all time career highs (longevity) or the best player in the game or had some memorable year combined with team success.
Holt is kind of a hybrid and kind of gets lost in the shuffle.
1) Didn't have longevity because of the knee
2) Was surrounded by other great players so kind of put at the back of bus. People don't think Holt when they think about the Rams run. Although they should as I think Bruce and Holt were the engines.
3) In most seasons, Moss and Owens and others, were considered better (Not by me but the general public)