Mansell is OK, far from our biggest issue. I'm unsure on how much better he can get and at this point I think he isn't a best 22 player. There is surely more dangerous small forwards available with better goal sense and same pressure rating. I have no issue if he comes in for an injured best 22 small forward which he sorta is at the moment of Jnr.
I'd be more interested in putting time in ensuring Jnr becomes AFL standard and if not make him the depth and then get in a small forward who is.