He doesn't 'seem only able'. Just because he hasn't proven it, it doesn't mean that it he simply can't do it. That makes no sense.
With Barcelona you can see his own, personal attributes very clearly, in La Liga matches and in the highest level in the Champions League. In fact, half of his goals don't even involve other players. So many amazing dribbles, passes, touches and shots are all down to him. There are other attributes also, where he controls the game and is the creative engine-room of the side.
I'm quite sure Messi can walk into any team and make it better. Far better, in fact. However, the other 10 players still need to be of a certain level of quality to get anywhere. Messi can improve a side on his own but he can't carry it, especially against sides like Spain with Iniesta, Xavi and others in all at the same time.
When it comes to the Argentina team, I think it's the coach's fault as to why Messi isn't showing his potential there. They're trying to play like Barca and set up like Barca but don't have the quality for it, so the performances don't reach their potential and Messi's gameplan suffers. They just need to find the right balance and use him in a setup which not only suits Messi, but also suits the other 10 players.
I don't ignore Ronaldo. He's one of the best, and you obviously haven't noticed the many people who claim Ronaldo is better than Messi. Opinions aren't clear cut.
But your theory of Messi not being as good in RM and Ronaldo being the same in Barca is really just made out of thin air and based on nothing.
