I'm leaving the silly numbers nowadays are paid for roles in the past didn't command such prices, because that's the market, hardly Enzo's fault.
Here are some things regarding Enzo:
He gain his place in River via hardwork, he initially was loan, he dealt with it by playing great and returned home being praised.
He was sold to Benfica, he was great since minute one there on every competition, including CL.
He was called up by the NT, he was given first team place and played great.
So lots of clubs started to seek his transfer...YET, HE SHOULD HAVE STAYED IN BENFICA FOR AT LEAST THE END OF THAT SEASON (dunno if Benfica itself pressure him with such a sum involved), not because he doesn't have talent to play in EPL (for christ sake sometimes people think that to play in EPL players should be Christ walking on water). But because he was in a great place, huge club, instantly loved, CL competition, gaining experience and consolidating.
Such a Huge PRICE TAG on your head in an already disfunctional team, with lots of new players and lots of injuries, etc...mmm not a great deal besides MONEY.You have to be another type of player and even with a diff role to actually survive that scenario if things do not click instantly with the team. You have to be a Tevez, Ibra, sort of fella and type of role and abilty to at least gain personal recognition even if the ship is sinking.
For me now he has TO DEAL with it, this whole thing of leaving now, stinks. It would leave a stain in his carreer even if he ends having a great one. Lucky for him, that stain won't be as huge as going to Real with bad timing or such, but still would be a stain.
To the very least he has to recover the level of his arrival to Chelsea, that was pretty good among a sea of pretty bad level. And he has to raise above that initial level, at least in an individual aspect.
He is young, he must not listen to the whole "leave this club now", he has to overcome it, earn it and even if Chelsea still sucks and ends leaving, he has to do it in a great individual level, sthg. it's not what is happening now.
Bad luck if Poch isn't nailing it, the injuries, the bad connection with his mates, he has to at least try it.