Bill Belichick explains the value of joint practices
Briefly

You run all your stuff defensively, you run your blitzes, you run your combination coverages, you run your disguises, you run all of those things that you're not gonna run in a preseason game, and you get to see them against another live competition.
So, you can really work with each other. I think your team can take some major steps forward even though it doesn't show up on the field until you get to the real games.
Read at Pats Pulpit
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