There are two ways to fix an undisciplined team.
Coach better.
Or get more disciplined players.
Maturity was a huge problem for the Dolphins in 2017, from the penalties (137, second-most in football) to the brawls (Jarvis Landry might have imperiled his future in Miami with his meltdown.
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So a housecleaning might be in order.
But that will only work if the players acquired are more mature than the ones sent out the door.