The lack between Messi and Fabregas is way to big. Messi scores nearly all of our goals. You are right when you say that Neymar will also score a lot of goals but you never know how defenders will work against Messi and Neymar. I recognized that a CF was a great tactical improvisation against Milan and we played very very well in this match.
Further, I remember Eto'o who scored so many goals for us. We had Henry on the left wing who was also a player who scored goals but with Eto'o as a CF, I felt a much better dangerousness in our offense. I know that we were successfull in 2011 too but Pedro lost his form, so our right wing is nearly useless, especially because there is no player in the middle who has good heading abilities. Rooney would add a bit of those to our team though he is not the best in heading.
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I accept your view, but I never thought of Rooney being a backup for us. The season showed me, that we have to improve our system because as I said before, football changed but tiki-taka didn't. I prefer playing with a CF who works in the defense and who can be used on different positions. I repect any other opinions.