Stability in the manargerial position is a good start to some academy kids eventually breaking through. Every manager has his own favourites among the youngsters, Ancelotti - Mceachran, Rafa - Ake etc, and Mourinho - RLC, possibly Solanke. Its a long process especially at a big club such as Chelsea with pressure to win titles every year and swapping manager, as some here are in/directly hinting at, would push back players like RLC's chances to make it even further Imo.