PWPW,
IMO, natural ability is something I always look for. Whether it is fielding, throwing, or hitting the most important thing to me is natural ability.
One of the very best shortstops I saw last year would consistently field ground balls on the wrong side of his body. But his feet, soft quick hands and instincts stood out like a sore thumb. He obviously was never taught certain things. It was all natural ability. Teaching him to field the ball correctly would only make him that much better.
IMO hitting a baseball is also a natural ability. We see lots of hitters that do everything right and they can't hit. We see some that do things wrong, but yet they can hit in spite of it. If you teach the player with natural ability how to do things right, he becomes that much better.
Now regarding the players that do NOT look the part. These guys need to be seen a lot. Seeing them once could be a forgettable experience unless they do something extra special that day. That is why so many outstanding players slip through the cracks.
There was a small outfielder from Chicago who wasn't extra fast, didn't have the greatest arm, didn't hit for much power. But he was one of the best baseball players I saw that year. In fact, he ended up being the MVP in one of our biggest and best tournaments.
Had he just stayed in town and played HS ball he probably would have played at a small college in Illinois. But he played on every big stage possible and people got to see him a lot. After awhile nobody cared about his size and the other things, everyone knew just how good he was. He then was recruited by Arizona State and ended up playing (starring) at U of Texas. A college All Americam I believe and then he was drafted.
I'm sure some of you can figure out who I'm talking about. Last name starts with a P.