When you get around 20-23 recruits per season and there are 22 starters, I think you should be aiming at approximately 1 of everything per year ( meaning 2 receivers, 2 OT, 3G/C, etc). I never understand why people make it more complicated than that.
Sure attrition comes into play, and if you land 2 of something one year (like RB last year), you have the option to adjust or only go after true blue chippers. I just don't think you should ever go into a year thinking there is any position that you don't want anyone.
Mason NEEDS this, Pistons, after all you've put him through