So you see a catalyst as a type of player, rather than a player in a specific situation?
Keane is a catalyst, but at Barca on the wing he would be rubbish, therefore catalysts dont always make a difference?
I would say, Keane is a catalyst if you play him in the right role, if you put him on the wing at Barca he is no longer a catalyst.
Likewise Silva. He might be a catalyst at City and wherever else, I would argue in a team where he was failing to make an impact he is not a catalyst.
A player is not born a catalyst, a player is a catalyst when he is in the right place at the right time. Or that is my understanding of it anyway.
So maybe Kagawa can be a catalyst for us when the team is set up in a way that gets the best out of him. I have no doubt he could be a catalyst, or that he was at Dortmund. From what I hear, he was. I just dont think he is a catalyst for us because he doesnt lift the rest of the team, not in our current state anyway. Maybe you are right, maybe he does a fraction but its at such a low level we dont notice it.
Anyway, these kinds of debates are boring, we have different understandings of what a catalyst is in this context. You dont need to try and convince me of his potential, I completely believe in it. I just agree with ACNumber, a catalyst for me is the kind of player who when he is in the team it plays noticeably better, the kind of player where if you are missing him for a big game you think oh no, how are we going to cope without him. That for me is not even remotely Kagawa in our current circumstances.