I'm all for having them work there to see if they are any good, but I think Castellanos needs to go. The Reds have an overload of these guys and they need a SS. They need money to get one. Let Winker play LF, put a real OF in RF and they have a bunch of guys to play CF. That would allow Senzel to move and Moose to move. Shogo can play CF.
I think people under-estimate 1B. It doesn't require a ton of mobility, but it is an important defensive spot. Other than the pitcher and catcher, it's involved in more outs than anyone and a guy who can't play ruins the whole IF. Votto never really got good at it. In the past he hit enough and the pitching was awful enough that his misplays over there were lost in the shuffle. This year, we're seeing the damage they can do. I think he needs to be moved off of there.