As much as you deny it, I can feel a little bit of frustration with Chelsea's policy to let young players go. It's inevitable that a club with this type of policy, one or two will come back to bite you, so it's a touch of double standards to be fine with the sales of Ake, Traore, Bamford, Perica, McEachran, Kakuta, T. Hazard, Van Aanholt, Bruma, Mancienne, Rajkovic, Jack Cork, Stoch, Di Santo, Sahar, Alcides, Diarra etc etc. (all of these young lads who were let go by Chelsea over last decade or so) and justify it with "well that's how we roll, and we win trophies, problem?", but God forbid if one of these players develops into what they're supposed to, hence why they're at Chelsea in the first place (i.e. De Bruyne or Salah).... "WTF JOSE?! WHY DID YOU SELL HIM?! ******* MUG."
It should be the same tune, you won trophies without them. You're either with it or against it.
Like I said, with a policy like this, it's pretty much nailed on that one or two will come back to make you look silly, so instead of fingerpointing at the particular manager who sold X, Y or Z, maybe there's a bigger picture.