Russell's had TWO chances at shortstop at the major league level. And Deeg - you have no idea if Baez AND Russell are better shortstops. Baez may be more "athletic" but he's much less sure-handed than Castro. Russell, I don't know enough about. If you don't trust the virtually unanimous opinion of scouts, trust your eyes. We've seen plenty enough of both Russell and Baez at SS to see that they're substantially better than Castro. Russell has much better range and hands, Baez slightly better range and a much stronger arm. If Castro were a star, I could see the case for not wanting to rock the boat - but this is a guy with a lifetime .730 OPS. He's not a star and never will be, and two of the last three years he's been abysmal offensively. He may recover and get his season numbers back to his career norms - or he may not - but there's no development curve. There's no sign of sustained improvement. Absent any overwhelming reason to the contrary, a pretty simple approach should be applied - play the best defender at the more important position. SS is pretty darn important. Bryant may have an overwhelming reason to stay at 3B although he's clearly not the best defensive option - he's the best of the prospects and a near-lock to be a plus-plus player, and his value is higher at 3B than LF. Castro has no such mitigating circumstances. It may not happen mid-season, but the Cubs would be crazy to play Russell and Baez out of position to keep a mediocre defender with Castro's offense at SS. We've seen very little of Baez and Russell at shortstop. I don't particularly care if they move Russell to SS in 2016, but feeling comfortable to move Castro off SS for Baez, owner of a career 41% K rate and .551 OPS, because he has a better arm (Castro's arm is perfectly fine) seems really silly to me. More or less silly than looking at 52 games and calling it a career? Despite the fact that the Rizzo/Baez comparison is very flawed, how silly of us was it to trade a guy like Andrew Cashner for a dude with a .523 career OPS? I'm not saying Baez definitely won't be good; I have some hope that he can be. However, with the huge red flags he showed, I think it's madness to move someone of similar defensive abilities for him, until he actually hits at the major league level. You said yourself the Rizzo/Baez comparison is flawed, and Cashner was coming off shoulder issues, so it wasn't silly at all.