So lets look at that because you will see that not only Watt is continuously getting doubled but so is a lot of other guys on that line:
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Here is the new D formation (didn't see a lot of it vs Buffalo) that puts Clowney and Mercilus on the same field. We got Mercilus ROLB, Clowney is standing DE, Simon lined up over Center, Watt is DE... Pleasant is covering the TE if he slips off the Double Team on Watt...and an ublocked Cushing stays on the RB.
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Merc gets a one on one with the LT, Clowney gets dbld by the center and LG, Simon takes the RG and Watt gets dbld by TE and RT...notice how Simon takes his man into the doubles on Clowney and they cluster 3 OLs in the middle. This keeps the triple team off Watt.
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Then the TE slips out into coverage, this leaves Watt and Mercilus one on one, Clowney and Simon then stay to make Brees pump the ball bcuz Clowney and Simon jump into the pass lanes.....
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Brees has to pull the ball down. Watt forces pressure causing Brees to intentionally ground the ball while getting sacked. This is what is allowing Watt not to get many "doubles" because of the attention teams still have to give Clowney and Mercilus.