Contrary to popular belief, most GMs are not complete morons. You can't just "convince" them that someone is a great player if they are not. Pie has the potential to be a very good CF and Murton has the potential, at best, to be a slightly better than average corner OF. I will grant you that there have been some bonehead moves by GMs in the past history, but you can't really just count on convincing another GM most of the time. I cross my fingers that you are somehow right, but I have a feeling if Pie is excluded, it will be something like: Marmol, Cedeno, Gallagher, etc. to get it done.