U cant say they flop here, they are not even getting enough game time to prove themselves in CHELSEA. There are a few reason,

1) Constant changing of manager, in order for manager to have faith and bring in youth player to the team, he will need a long time to monitor them first. And being CHELSEA manager not getting result = sack therefore they are not going to gamble.
2) Because of above, we buy most of our 23 player, even our sub are establish player that youth have to get past before even challenging the first eleven spot.
3) Because of above, they did not wish to stay and fight for their places eg. LUKAKU, DE BRUYNE. Result have prove they make the right choice for leaving, is our lost but there is no way LUKAKU able to dislocate DROGBA at that time but if he is make the 2nd striker instead of 3rd, i think he might stay.

Cant blame the board too much even though we dont like, as the club have been very much successful running the current model. I think we are the most successful english club (base on trophy won) since RA takeover. And most of the youth we sold have prove they are not good enough to play for CHELSEA first eleven anyway.

Yup no no for Van Dijk. So expensive and we already have Azpi, Cahill, Luiz, Rudiger, Christensen, Tomori, Clarke-Salter.
Drinkwater is good tho.