I don't know what's a helm but i will take it as a compliment since i see top class......top class sounds good
If ronnie got more chances in his early days manutd would have been more successful back then. He was miles better than the old men they had in the team ahead of him.
Also, xavi has been lucky not to have his barca teammates getting long injury spells. If Messi goes down injured next year you will see barca struggling to qualify for the europa league. Do they still have Intertoto cup? You will see xavi playing 40 yard passes and switching play in the Intertoto cup 
Meanwhile ronnie will be busy banging in the goals and turning defenders inside out in champ lgue.
I guarantee if you replace xavi with any other decent player like alonso, modric, scholes or even young thiago alcantara barca will be just as successful.

none of them have as good an eye for passing as xavi
he dribbles better than them, and knows where to go. He makes many unexpected passes. The teammates run into positions because they know xavi can pass accurately. And this happens frequently.
he doesn't crumble under pressure. alonso in real madrid is like a useless ghost, modric is boring and clearly not as good at passing as xavi, scholes is too old and doesn't perform as well as he used to, and thiago is not as experienced as any of them.
without messi, barca won't play as well.
without xavi, barca won't play as well.