I think in the Mike McCarty style of offense, Jones wouldn't have or at least shouldn't have been resigned. However, in the MLF run offense, he must have been considered a "must keep piece". Makes sense, he is a dual threat in this offense and as a result, gives the Packers offense a much better balanced attack.
Don't anyone fall over when I say this, but keeping Jones and paying him that much money, was probably a better move than using $10M on a FA WR (yeah I said it) and the rest on a FA RB. I think with Jones, barring an injuring, the Packers know exactly what they have. Of course, none of this means that I have given up hope for a WR room upgrade.