If you are going to trade Sano, trade him while he's still considered a third baseman and has two years left. It would leave a massive gap in the lineup and I have my doubts that he's worth much of anything in the ways of major league starting pitching, and wouldn't trade hiim. Personally I think, if you can't sign Donaldson, Moustakas, or trade for Bryant - leave Sano at 3rd primarily, sign Brock Holt, and rotate Marwin, Miguel and Brock through the corner IFs.