During his time at Chelsea, KDB didn't make a significant impact on the club, leading to his sale to Manchester City. Under Pep Guardiola, KDB achieved the best of his career, winning several titles with his teammates. Coaches play a crucial role in a player's development, as many players sometimes lose their best skills under incompetent coaches. In the Premier League itself, there are many examples of player quality, some with good initial skills but ultimately deteriorating because the coach failed to recognize their individual abilities.
Chelsea released De Bruyne to Wolfsburg when he was 23 years old then the following season Wolfsburg released him to Manchester City well, here De Bruyne reached his golden age and you know Wolfsburg made a profit of 54 million from this player in just one season Wolfsburg bought him for 22 million and sold him for 76 million. Now KDB is in Napoli lineup and many people think that their performance will decline due to age factors but we'll have to see when the new season starts. I think Napoli are quite lucky to get this player for free and may still be effective for the next 2 seasons.