I like where you're going and agree with most of this.Let see where the weaknesses are on the team:
On offense: QB, LG, WR3, backup TE.
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On defense: 2 DTs, FS, 3 CBs (NB, and 2 backup corners).
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I don't see Tua as a weakness, though. When he's healthy Miami wins games. But if you're talking about questionable due to durability, then we are on the same page.