Regarding Sano vs Arcia, if Sano ends up moving off of third base would he really have less defensive value than Arcia does now? If he does, it will be slight. If Sano can play a respectable third base, he'll likely have much more defensive value than Arcia. Sano does have contact issues, but Arcia has severe power issues compared to Sano. Most scouting reports I've read state that Sano has the hit tool to utilize his power. He probably will not ever be a .300 hitter but he could be a .270 hitter, combine that with a good on base percentage and potential 40 home run power and it should be pretty clear why Sano is listed unanimously as the much better prospect. Also, it should be noted that right handed hitters actually take a bit longer to develop than left handed hitters, so you should take that into account.