Totally agree, have been saying this for 2 years now, he is the best in history but currently he is a tactical problem at the same time.
Replacing Rakitic might be nice start and everything, but then we have a problem of balance too.
Do we play 4231 (or 442 whatever you want to call it) as we are doing more or less now in the league? Thing is would always put Messi in same position, he will continue to be AM more than a 2nd striker. I am all for 4231/442 right now as it helps Rakitic and most of our current players to play in their comfort zone
Do we go back to 433? That could create a more balanced midfield but what about the sides? we need balanced flanks so that midfield don't get dragged distally, Messi days as RW are over, do we keep Suarez and Dembele and play with non-symmetrical 433 like Lucho last days? or play Messi as false 9? but then again signing Griezmann -which seem inevitable- makes those ideas unlikely.
I don't know man, it is always easy to say that a world class addition will solve problems, and in many cases they do tbf. but sometimes it just doesn't work that way.
Play a 4-3-3 with Messi as a False 9 closer to the goal and Griezmann as an inside forward on the right side, move Dembele to the LW.
Drop Rakitic and bring in another creative midfielder that isn't slow as hell that is capable of getting past players. Tell Dembele to get his ass running defensively like Neymar often did in his final season, Griezmann can already do that. Semedo or whoever our RB is going to be need to be more potent offensively too.
The two midfielders + Griezmann and Dembele need to constantly move off the ball, Messi too need to make more runs off the ball.
Give the keys to chance creation from deep to Coutinho and the other midfielder. I cannot find a better solution this problem.
A 4-2-3-1 could work if we had a prime Arturo Vidal alongside Busquets, but we don't. We have Paulinho. The Brazilian guy that got no positional awareness.
As for the midfielder alongside Coutinho then I don't know who could work. We need someone that can start right away and be consistently great. Losing out on Kroos for 25m really hurts right now. He would have brought the balance needed.
Sergej Milinkovic-Savic is an interesting player that would get the guys that want physical players start drooling too with his impressive stature and strength, 1.92m tall and strong like a bull, but he's not WC yet or at that level and I don't know how he would work. I would prefer an established midfielder.