So has anyone thought about why the Jets would trade Vilma?

REALCHRISM said

The Jets did not run a 3-4 during that time. They did not run the 3-4 until Mangini arrived.

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So why does an athlete like Vilma have trouble in a 3-4 as opposed to a 4-3, but a guy like Thomas can put up monster numbers in both?

Which ILB position did Vilma play in the 3-4?