With such massive rosters, there's also a diversity of personalities and degrees of mental toughness/focus on NFL teams. My only concern has always been that not everyone is as hungry and focused as Patrick, Kelce, etc. That's why you replace players that you think have grown complacent or tired (or just in it for their payday) with rooks or players that have never won. I've noticed this runs in 3-4 year cycles. Regular champs like the Chiefs can't afford to keep players - even talented ones - that are not obsessed with being great.
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