I'd say he solves our left center issue, which is currently ear marked for Copley or in the future goes to either Coates or Staggs moving from their favoured right side.i actually wouldn't be against Mann at the right price ... very versatile, and wasn't too bad for the Knights this year.
although, i'm not sure why he would come to us, I don't see a spot in our 17 for him when we're at full strength
Pretty sure he's left handed or I think I've seen him kick with his left anyway. That usually lends itself to a left hand carry, which is suited for a left center.
I think a lot of us, or maybe it was just me, were suggesting Mann to jump into left center for origin, and he probably would've, but took personal leave with his mum's health and rightly wanted out of the bubble.