maybe tata wants him to bring others into play a bit more the other forwards are in good form this season so the team should utilize that an learn to play more with out being over dependant on leo all the time remember how lost they looked at times last season without him. also messi is normally marked out of games by three or four players so if he can lay on a goal chance for a team mate then he may aswell then when neymar comes back barca have another threat for defenders to worry about which in turn will leave a bit more space for messi to unleash himself in