I agree; it's easy to make a bad player good than to make a good player amazing. Most of the already-good-players, their playing style occurs to them naturally and are not easily amenable to any changes. Moreover, they need microscopic attention to notice minute deficiencies in their playing style. That's not an easy job for a coach. For a bad player you just start from the bottom to the top. I guess that's why the best players in youth teams, are not the best players at senior level.
I agree; it's easy to make a bad player good than to make a good player amazing. Most of the already-good-players, their playing style occurs to them naturally and are not easily amenable to any changes. Moreover, they need microscopic attention to notice minute deficiencies in their playing style. That's not an easy job for a coach. For a bad player you just start from the bottom to the top. I guess that's why the best players in youth teams, are not the best players at senior level.