Regarding "natural talents", it is important to note that nobody considers Maybin to be in this class of ballplayer.  He was drafted as a "raw athlete" who is being made into a baseball player because his tools line up so perfectly with the sport.  However, in that regard, Maybin may well be considered a natural talent.  Very few people are naturally so well-equipped to excel at their chosen profession.  Maybin has very strong wrists and a lightning fast bat that portends potential power.  He's got a body that oozes athleticism which will heighten and prolong his prime, and tons of speed to ensure he'll make the most of whatever he does out on the field (whether beating out grounder, stretching a hit out, or flagging down a fly). Maybin has terrific hand-eye coordination, and the sort of makeup that will allow him to eventually take advantage of it.

In terms of wonderkids, which I take to be the natural talents you were referring to, virtually all the players we consider "natural talents" are blessed with at least remarkable hitting tools.  The two go hand in hand.  No player can grow to be tremendously skilled without the requisite tools to allow him to learn.  

Maybin's baseball skills are improving and his peak capacity as a baseball player is virtually unlimited.  It will require more time for him to become that player, and I do believe that he's very far from that day, but to act as though Maybin is lacking in natural ability is a fallacy.  He has a plethora of natural ability, and he is in the process of converting it into learned skills.    Maybin doesn't yet have all the talent in the world, but he does have all the tools and he may yet be a great talent.