Not as many goals no perhaps. But look at last World Cup. Everyone agrees Messi was poor. Yet he was still easily Argentina's most influential players and Argentina reached the friggin' final.
Obviously he is Argentina's most influential player, the team is built around him but I don't think that's the case in Barcelona.
He's the most important player in his club but they can still win most matches without him and Suarez and Neymar will still score the goal not as much as he does though.
Iniesta has been completely out of form this season barring the past couple of months maybe, Xavi barely plays anymore. Messi is still as good as he ever was and is going to pass the 40 league goal a season mark yet again, how do you explain that?
Can you ignore the fact that Barcelona do still apply the playing style that was adopted and created under Pep? What I am saying is that Xavi and Iniesta played a big role for what Barcelona is today just like they did with the National Team, dominated for few years.
Again, I am not taking anything away from Messi, Xavi is not a starter anymore but the system and Xavi replacements adapted well, Iniesta could be out of form but he's still the brain in the midfield and it's easy to play beside him.
Leo fits in that system perfectly, he's fast, doesn't have to defend or run back, can sprint anytime and plays easily the one touch pass with anyone, incredible talent couldn't get any better for him in this team. But if he doesn't score/use his chances (he does), Suarez will and Neymar will. That's why If we take Messi's half goals away Barcelona would still win most of their matches.