Barcelona are a politically significant club, they represent Catalonia and their fans are mostly pro independence. Playing the game may (or may not) further increase the tensions which can have an effect outside the game.
Also the security for the game itself might not be good enough, there...
Griezmann would be great for the lw/st hybrid role Suarez has atm. Even though theoretically Suarez should be world class in that role because he can play anywhere across the front three
The stuff about Messi having fights with those players is nonsense. Pep had issues with Eto'o and Ibra, not messi.
Ibra always had positive things to say about Messi