A few years back Kevin Colbert put forth an idea that the BTSC draftniks have adopted as a sort of gospel truth. Paraphrasing, it goes like this:
Every year there are 5-10 special talents who can dominate entire games. Those are prospects you never pass up regardless of need or position. The NFL future is too unknowable, injuries too common, and game changers so rare that you’ll end up with regrets.
After that you have a bigger group of clear 1st round talents, another of legitimate 1st rounders, and so forth...
We organize each year’s BTSC Big Board on that general idea.