I'm in a deep dynasty league with an extensive minor league system.  I'm a rebuilding team, but have drafted well over the past 18 months and made a few shrewd trades to build up some names at a position lacking in extensive star power: 3B.  My MLB starter is Ryan Zimmerman, and Sano, Arenado, and Matt Dominguez are all in my minor league system.  I'm fielding offers for all three players, and am looking for opinions on any or all of them.  Keep in mind, this is just for fantasy purposes, so we're mostly geared towards offensive stats (even though we do keep track of errors for fielding).  If you had one of the three to deal, who would you deal, and why?  Much thanks!