Hmm. Two teams have joint practices in August. Competitive but mostly vanilla play and plays over 2 days of practice and a pre-season game. Result 1 player on struggling, non-improving team thinks "Hey, weeze as good as dayiz, we'll show it nexx year" by the end of another dismal campaign. Other team slowly improves, changes new players mid-season, adds schemes, challenges it's mental focus, loses 2nd best player for the year, fights through it's own struggles to play as 3 cohesive units to have best record in NFL Yup, da same.