Wow you are so way off. Terry had over 150 games for Chelsea already and had been Captain for quite awhile mate. You really do spew out anything.It was Mourinho who named Terry as his captain despite his young age, and also made him a guaranteed starter. Under Ranieri their captain was Desailly, and their starting CB pairing was Desailly/Gallas. Terry was used as a rotation option. He has repeatedly credited Desailly for being his mentor and for helping him improve his game.
Since then, the following youth players, who were said to be promising, have either had their careers stalled or been sold -
Jody Morris
Jon Harley
Sam Dalla Bona
Josh McEachran
Carlton Cole
Daniel Sturridge
Nathaniel Chalobah
Ruben Loftus-Cheek
Andreas Christensen
Romelu Lukaku
Nemanja Matic (re-signed for 10x the cost)
Lucas Piazon
Ryan Bertrand
Kenedy
Patrick Bamford
Marco van Ginkel
Nathan Ake
Chelsea is literally a graveyard for youth players. In that same time frame, UTD gave significant opportunities to Ronaldo, Fletcher, Cleverley, Macheda, Evans, O'Shea, Blackett, Nani, Anderson, Rooney and Rashford. Ok, some of them flopped, but they were all given significant game time and a lot of them had decent careers at the club even if they faded afterwards. Obviously Ronaldo and Rooney ended up being world class stars and I believe Rashford will follow suit. By the way this is not even including the Class of 92.
We also made a mistake selling Pogba but that was the one anomaly in a long history of showing commitment to youth.
As for Chelsea being a graveyard youre correct at some degree, but thats how Chelsea make money. They hog all the talent and sell them off later on. Whoever becomes good enough, they keep. It makes them some money and if they get lucky with an exceptional talent, all the better.