Whenever I hear about personnel groupings I cant help but want more information. What I mean is you will hear a team is in 12 personnel x% of the time. That tells you 1 RB, 2 TE's and 2 WR's....all it tells you is the position of the players on the field. What it does not tell you is the lineup. You could be in 12 and have a spread formation. With position flexibility nowadays I think it would be good to provide groupings and formation. If you have Kelce and are in 12 and he is always split out wide, effectively this is more like 13 because Kelce is such a great receiver.