It's not very different, right about that but this way there's Suarez in front of him, occasionally Paulinho, ideally Griezmann who will stretch the defensive block and free some space for Messi or be open to receive the pass and finish.
Otherwise you have Coutinho and Dembele who will do what? Try to find Messi?
No. When Messi is deep they cut in. JDP allows for free roaming in the final third. Positional structure is only maintained in the other 2 thirds. How does Paulinho play in this 2 man central midfield of yours? Suarez - striker, Messi - 10, Coutinho - LW, Dembélé/Griezmann - RW, Busquets - Pivot, Paulinho - Pivot (Ahead of Messi in the box?). If a 4-3-3 is a counter magnet then this setup is a recipe for disaster.
What you're trying to describe is typical of a 4-3-3 False 9 with an outright 9 used as an inside forward. In that case Paulinho as the box to box option has freedom to dart into the box.
Space is not space. That's why zones exist. I think that with time teams would prepare themselves for our 4-3-3 false 9. Remember that the cure is this time known and it needs to be trained.
There were tons of space last season vs. Juve. What did we create? Nothing at all.
Having an option in the box to receive crosses has become a must since teams defend way better than they used to.
That said, using false 9 from time to time to surprise your opponent is the way to go, IMO. Even in CL, why not?
Yeah and Suarez playing through the centre in 3-3-1-3 with Rakitic as a RW and Roberto as a RCM. Not a very good example because Messi was the only excellence and created 2 clear cut chances that were wasted by Suarez and Iniesta. Even with a 4-3-3 False 9 there is always an option in the box or do you think that it is only an outright 9 gets that opportunity?
There is no cure for a False 9 or any possession based tactics other than parking a bus but how is that any different to parking a bus against a 4-4-2 where Messi drops deep in any event to find space?
The problem is that you want us to keep 3 in the midfield. You can't do that. You can't do that.
In 3-3-1-3 you sacrifice FBs. Shouldn't do that.
So what's your solution to our midfield problems? A 2 man midfield (4-4-2/4-2-3-1) because that's where we're headed by shoehorning both Messi and Suarez into the 11... Coutinho will play LW/LM and Dembélé or Griezmann RW/RM. Busquets automatically gets the one pivot spot. Or a narrow 4-3-1-2 but where does Dembélé and Griezmann fit into this because there is no attacking width. It's enough that Messi already significantly conditions the team tactically but here we have not just Messi but rather 2 others in Rakitic and Suarez doing the same... It is not sustainable. You need players that give you options like Dembélé, Griezmann, Coutinho, Arthur, Thiago because they play in multiple zones on the pitch and they do it with aplomb.
A technical midfield is your bread and butter, Madrid/Bayern etc figured this out, but yet we, as the pioneers, want to move away from it.