I absolutely would not trade Rosario or move Sano to the outfield. Rosario may be the best pure hitter of our outfield prospects and he plays good defense. Why would you not want him on your team? Sano is most valuable as a third basemen. He could be an average defender there, but will always be below average defender in the outfield. Trade Plouffe and give him his shot. Plouffe is league average now and is unlikely to improve in any meaningful way. Now is the time to trade him. Ideally we would start the year with Rosario, Hicks, and Arcia. Then end the year with Rosario, Buxton, Kepler, Hicks as fourth outfielder and Arcia as DH or bench bat. Who knows what will happen of course and if we end up with three good outfielders out of the five we should be happy.