Serghei you have the cause and effect relation all wrong.[MENTION=20484]gasgas[/MENTION], you have the cause and effect relation backwards. Not having Alves to combine with is the reason Messi doesn't stay as much on the right. With Alves on, he used to have a lot of action in the right, because Alves is a playmaker. He was able to find Messi with through balls even in the tightest spaces. Roberto doesn't even see those passing option which Alves saw, or if he does see them, he doesn't try them because he is a) not as confident in his abilities, or b) not as skilled to do complex passes. A lot of Alves passes were highly technical. Roberto passes are flat, normal passes. Alves used the exterior of the foot a lot of times, much like Marcelo does now, hence his abilty to play more complex passes.
Passing lanes are still there in midfield and on the right, for players like Xavi, and Alves to find them and use them. It's the players that are missing. And when Messi feels he doesn't get quality passes going his way, it's natural for a player of his stature to look for other ways to get involved. And that means going more in the center.
Messi moved from the right to the center because the midfield has lost all control, it is non existent. Him being the most creative player in the world, he believes that he can exert his creative influence better there.
He used to have a lot of action in the right because he actually played there, because the midfield didn't need any help as Rakitic and Iniesta had it under control, and Messi only focused on combining with Neymar and Suarez.
Now the midfield is a mess, nobody from midfield can do anything with the ball and so Messi has to be the one to take the ball from Busquets and do something.
This explains why this drift towards the center tends to happen a lot more in big games, even when Alves was here, Messi would go to the center of the field to help the midfield.
Now that our midfield is dead he has made the center his permanent home
Now the highlighted part. I can challenge you for a week to look for such instances and you will find that they are non existent.
Most of the times when Roberto receives the ball, Messi is found moving towards where Suarez is, around the center.
Messi hardly ever makes himself available to receive a pass from Roberto, because he drifts centrally with 4 players infront of him. I was watching a few Roberto highlight videos and that was one of the striking things i saw.
Alves used the exterior of the foot, fine
Where was Messi when Alves was making such a pass?
Was it not on the left wing forward position making a run?
How can you expect Roberto to make the same pass when Messi has moved centrally to be amongst the 4 hungry defenders marking him?
Take a Roberto video from youtube and analyze the passing lanes he usually has to work with.
Very rarely you will find a passing lane to Messi unless in those few occassions where Messi has decided to visit the RW
Most of the times it is Rakitic or Busquets, or worse the CBs