I don't think he'll struggle too much in going to the US, unless he's sent to redneck ville he shouldn't have a problem. Maybe the DR will be tougher but I really think people overestimate the culture change factor.
This doesn't seem that uninformed to me. He said he either goes to Florida (rookie ball) or the DR for one of their seasonal leagues. Isn't that the way it usually works for raw talents?
He commits throwing errors mostly, he has elite range as evidenced by the metrics. A lot of good fielders' errors (Lawrie can be included in this also) comes from getting to balls that others wouldn't come close to.