The answer is 'this is why neither of Russell or Baez is getting traded', but if we go along with the hypothetical, odds are it would be someone currently outside the organization. There's a lot of reasons to not trade Russell, but 'we have to have a player of Baez' ability as our backup shortstop' has to be pretty far down the list. It was great last year when our pitching staff was shutting everyone down and then we also had the ability to plug in a 3 WAR 23 year old top prospect all over the infield, but things have changed a little bit since then. If Baez or Russell lets us go from Lackey (or Butler) to a quality starter, I'm going to be worried about the trade...whether we got damaged goods, picked up a rental, gave up a future stud, etc. Not so much about letting Happ take over the util role and having to trade a lottery ticket pitcher for Jose Iglesias or whatever.