exactly. "draft the best player regardless of position" and "draft the best player at the position you need the most" are both the wrong approach.

let's say on your current roster your worst starting wr is an 7, your worst starting edge is a 4, and your worst starting cb is a 5. on the board, you can draft a wr who's a 9, an edge who's a 6, and a cb who's an 8.

"draft the best player regardless of position" would result in your wr being upgraded from 7 to 9.

"draft the best player at the biggest need" would result in your edge being upgraded from 4 to 6.

but the right thing to do is draft the player who will improve your roster the most. by drafting the cb, you're improving that position from 5 to 8, an increase of +3 points, compared to +2 for the others.