Can not see Hinch going with only 4 middle IFs for more than a series or two. Wouldn't be prudent.
Whether Schoop stays or goes, there will be a 5th MIF. I suppose it's possible someone will report Vierling has started taking IF practice - but till then I'll retain my doubt he is it. Camargo the more likely replacement for the LH IF bat lost when Maton was sent out.