Please correct me if I'm wrong, but wasn't his option for this year already spent since he was up until Mid May? If it were me, I'd trade Cesar(if possible), slide Rosario over to 2B, and let Andres play SS for the remainder of the season. I don't want to wait until next season for him to iron out any wrinkles. If you get that offer that can't be refused for Amed then you have Miller, Clement, and Chang to fall back on. Meanwhile, Mercado can continue to show if he is finally realizing his potential and Amed can be the insurance policy or even share the CF load.