That's my exact point with my example; if a CB, or a WR as you say (Sterling Sharpe) had a similar career as Davis, this wouldn't be a conversation, they just would not even be considered.
I may be off about WRs, but then again, there is Lynn Swann. My overall point is that offense players are over-represented vs. other positions, considering the ratio of players on a team. So my overall respect for the HoF's process is not very high, and Terrell Davis being considered is a prime example.