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Surely not?! Well. Maybe...
Suggesting a Mario Williams trade is tantamount to blasphemy. Yet there seem to be solid reasons to consider it. Ponder this: Williams looked a little lost as a 3-4 OLB in Wade Phillips's one-gap 3-4. He's 290lbs, which is almost (but not quote) 3-4 DE size, but if you stacked at DE you'd lose some of his unparalleled speed by stacking him in front of bulky O-linemen. But when you put him standing up at 3-4 OLB, he loses a touch of his explosiveness, too.
In short, he doesn't look like he quite fits in the Houston scheme. He might adjust, but he might not, and having a fantastic 4-3 player toil away in a 3-4 just gets them frustrated and unproductive (Albert Haynesworth, anyone?).
What he loses in ability in the 3-4, he might gain in trade value to a 4-3 team. He's an utter wrecking ball at 4-3 DE, and everyone knows it. And because they know it, they're likely to pay for it. Bring in the Minnesota Vikings.
The Vikings lost Ray Edwards to the Falcons in free agency, so they've got relatively untested DEs opposite Jared Allen. At the same time that it seems their pass rush is weakened, their division rivals have all strengthened their passing game—Jay Cutler at the Bears, Aaron Rodgers at the Packers and Matt Stafford at the Lions can all pass effectively.
If the Vikings are to have any hope, they have to find a way to shut down the passing game, else they'll effectively forfeit six games a year automatically. Enter Mario Williams.
What would the Vikings need to give up to get him? A lot, obviously. But is it worth it? Most likely. The Vikings have to keep some semblance of dignity to go with their new stadium plans and potentially iffy franchise survival. To cement the Vikings in Minnesota, they might need to rope in a scary pass rush, and Mario Williams is their man to target.