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To me the question is not if Mafi is better at lock or flanker, but is the team better with Mafi as a lock and Cottrell at 6, or Mafi at flanker and Wykes/coleman/steenkamp at lock. I prefer him at lock because he does bring that extra running ability to the locks and gives us a good flanker. I don't think he is significantly better than Cottrell to justify him there and downgrade our locks.
Either way...Go FORCE GO!