I think that in a way we are dependant on Messi, but I think that almost applies with every team's best player. We're a worse team without Messi, thats natural, of course we are, he's the best player in the world and not having him in your team lessens our attacking force, but I dont think we miss him AS much as we could. Obviously when Messi isnt in the team, people will be unhappy, you miss his runs and ability to entertain, his ability to win matches, but then we have people like Iniesta, Xavi, Eto who can make up for that.
The difference between Man Utd's "dependance" on Ronaldo, and on Messi, is that if we were to lets say sell Messi, we'd lose more. Messi's attitude both on and off the field is impeccable, he takes a huge amount of fouls from opposition teams and still gets up. He recognises Barcelona isnt all about him, we're a team, thats how we play and why we've won the treble this year. By selling Ronaldo Man Utd have of course lost a HUGE asset on the field, but I think that they've gained that back off the field, Man Utd can go back to being a team, not about Ronaldo. If they make the right signings, combined with what they've now gained off the field by selling that petulant little ****, they can fill the gap Ronaldo has left. Obviously its easier for me as a Barcelona fan to say that, it would be more difficult as a Man Utd fan because I'd be gutted, he might be a **** cunt but Ronaldo is still fantastic, losing your best player is a kick in the teeth to any team.
I dont think we could replace Messi in any way, he's better than Ronaldo this year, we wont sell him, like I said he's not like Ronaldo, he will stay at Barca, hopefully we wont see any injuries =].