Considering that they won a World Cup and 2 Euro - Yes they might very well win the CL without Messi!
True.
But my point with Messi was:
About Xavi-Iniesta in Spain, they never had to play against a World class team WITH Messi.
Spain vs rest of the world was: Spain vs 3-4 good teams. But none of those teams, neither Spain, neither others=had Messi.
Messi's team was like Villareal.
Basically, Barca vs Villareal.
My point again, imagine if Messi was let's say from Germany or France, one of world class NT teams.
Do you think that Spain would win all those trophies in 2008-2012 against let's say France, with 20 world class footballer, plus with Messi in attack?
So, my point again, it is hard to really measure how good Xavi-Iniesta alone were WITHOUT Messi.
Since in Barca they played together and they were overpowered.
And in NT teams, Messi played with 10 monkeys in a team against a well-glued Spanish team.
So, imo, even though it is awesome to have Xavi and Iniesta in a team, it is hard to tell whether those two alone, without Messi (or if Messi played for let's say Real) would have brought CL titles.
Messi was by far the biggest factor.
Just like CR7 in Real.
Modric, Kroos and Isco can't win shit today with CR7's magic upfront.