#4 Provides game time to youngsters

Many youngsters showing promise get valuable game time and experience playing at loan clubs. This opportunity wouldn't be available to them if they stayed at Chelsea because there's only room for 11 players on the pitch.
Instead of the players in question warming benches for seasons at a time without real-time experience in matches, the loan system connects them to clubs where they can play regularly. This has the dual benefit of providing the youngsters with game time and experience.
Thus, by the time they return to Chelsea, they are ready in all respects to represent the Chelsea crest.
Notable players who've gone through this system and have come out shining for the Blues include Andreas Christensen and Victor Moses.