Most true atheletes that can master one sport can shorten the training to become proficient at another. Michael Jorden was a great golfer and so so baseball player, Bo Jackson could have been a hall of famer in Baseball and was an amazing running back, just 2 really bad examples. So the gist of where I am going is...Maybe. If he can translate his eye hand coordination it took to become good at baseball to the concept of casting line and not a weightless fly then he may pick it up quickly, on the other hand if he can't wrap his mind around the concept no amount of physical gifts will shorten the learning curve