Micheal Johnson is most likely going to be a big contract whereas Arthur Jones is more likely to be in a range the Patriots are willing to pay, and Johnson plays DE where the Patriots are young and have their starters, I doubt they go that route and think Jones makes much more sense. With Chandler Jones and Ninkovich set as starters and Buchanon as a back-up all they need to do is draft another DE prospect to back up the starters and develop, whereas signing the DT in free agancy sets them at DT and means they don't have to use a high pick for a starter. I think Kelly could still start but getting a starter in free agency that allows he and Wilfork to rotate would be the best use of their resources. It may also have the side effect of influencing the contract negotiations for Chandler jones when his deal comes due in a couple of years. I am guessing he will love playing beside his brither and wouldn't want to walk away from that for the cash.