RS guys with good potential and WE--If you happen upon a "sky's the limit" player, RS him regardless of position. Other than that, Generally RS players that will have the highest singular impact on the game; I believe this would be QB, RB & WR, and maybe DL or DB. I had success keeping at least 1 QB redshirted, and then I'd decide on others depending on depth, and who I was able to recruit. If it's a choice b/t a higher vs. lower rated player on his position skills with equal WE & Pot, I'd RS the better player and get a better Sr* season from him. Hope this helps!