Just playing devil's advocate here since I already stated above that I'd rather have two picks rather than move up to get one.
Using your logic however, since you feel that ranges are appropriate then any pick on the top 5 should include ALL the players (save for the top 4 if we assume your picking at #5) available in the draft since your argument says that you should include all players available and not strictly a position for position analysis. If that were the case, and since this thought process is from a hindsight perspective, then wouldn't it be better take the top 5 pick (again strictly based on your argument) because then one can pick from a greater number of players?