Interesting topic. However, in certain instances we may be comparing apples to oranges because there is no clarification if we are looking at their college careers only or their college and NFL careers.
As examples: If you are looking at purely college careers, IMO Dan Marino is NOT a clear winner over Collins in my book (their positions in the NFL draft prove this point) and Hugh Green may be the best defensive player on either team. However, if you take into account professional careers, Hugh Green's status drops significantly and Dan Marino is undoubtedly the best QB on either team.