If Killen wasn't being played as a DM then I'd think he's ahead of both Smeltz and Fallon purely because he seems to have a more complete skill set than either. With Wood and Rojas definite starters and possibly Kosta and WeeMac out there as well we shouldn't really be lacking for the goalscoring that Smeltz provides or the elbows in defenders' faces that Fallon provides (as in we shouldn't be playing a style that needs a player like Fallon, especially if Wood and Killen are there too).
edit: Brockie has had a great season scoring goals for the Nix but I think he'd be best used on the bench by the AWs because of his versatility.