Well for several Sox prospects / players losing Merrero will be felt.
Along with Travis Shaw, Betts, JBJ, and Swihart, were very close buddies having come through the system together and have been roommates. These guys were very, very close.
3-4 years ago I saw a story of how they all lived together in ST ( minus JBJ who was married ). They knew all about each other.
So in that sense, losing Merrero is not such a routine thing. I guess being the 24 pick in the draft is no lock to be an MLB star.
Anyway, I saw him play a bunch in Pawtucket. I am sure I saw an error here and there. I just don't recall them specifically. I also saw dozens of really good SS plays. Better than what we have remaining north of AA, anyway.
I think he can be a decent replacement type player. Especially on turf where his lateral range, speed and solid arm can save runs. I think he can hit better than .208. Maybe .230-.245. If so, he may stick a while.