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bsr, you're dead on. Wilson's ability to run for 10-15 yards seemingly at will in late game situations is what makes the Hawks near impossible to close out. Remember the OT Bears game at Soldier Field? The Hawks offense transforms from Lynch + playaction off of a fake to Lynch into something considerably more dynamic.
I also assume that Bevell et al know how wonderful this trump card is, but are unwilling to put those miles on Wilson's body unless its 4Q and close.