Football is an art, not Maths.
For Barca, football is both art and maths.
I am not talking about Neymar now, but in general.
If we will win trophies in Mourinho's style, and play ugly=our fans will be angry.
If we will play beautiful football without an end product and without trophies=our fans will be angry.
= we usually need to play both beautiful and effective.
About Lampard and Iniesta, it is not that simple.
Every team needs a different type of players.
Barca can easily survive with Xavi+Iniesta without goals (even without assists), as long as our team in general is controlling matches, dominating and usually creating 15 shots per matches.
They will create something (not assists, but pre-assists), and attackers will score.
About Neymar not creating assists, I don't mind about that, because our current system works more or less good even in this way where Neymar is a scorer and not a true playmaker (like Messi, for example).
Midfield and Messi will create 20s of chances, and Messi, Neymar and Suarez will convert 3-4 out of them.
So, there is no problem with Ney's assists in the current system, imo.
But, in some other parallel universe, where we wouldn't have Messi on RW, and Xavi/Iniesta/Rakitic as Mf's, well, in that case our team would create less chances and then Ney would need to change his game to deliver more assists, because we wouldn't have current creators then.
The same about Lampard/Iniesta.
Lampard would be a crap here because we need creators in midfield, and not scorers.
On the other hand, Iniesta would probably be a weaker midfield player in Mourinho's Chelsea from the past than Lampard, because Lampard offers some different things.
So, a football is both maths and art.
But also, all players should be looked in the context with whom they are playing and what is their duty in the team.
Pedro can play well with Messi and Suarez around him.
But 3 Pedro's in the attack wouldn't work because nobody would score then.
Ney can play and score a lot with Messi and Suarez around him.
But 3 Neymar's alone in the attack, probably wouldn't work too well, because each one of them would be more a scorer than a creator, so 3 Neymar's in attack would lack balls and chances created by their teammates.
So, a lot of things are influencing how a player plays and how many Goals, assists and preassists he has.