Unless Harbrow has improved out of sight as a rebounder, I think MDB needs a midfield role... as a negating forward role against Brennan or Harbrow doesn't seem a fair trade-off (compared to using a more genuine attacking forward).
I want to see this as well - it allows us to see MDB's good handball skills in the middle and of course we plonk Crozier onto the HFF instead who has not put a foot wrong yet.