From interview published on planet-f1.com
"A lot of media focus has also been cast on Michael Schumacher after his disappointing start to the season. People say it's because he's been away for three years and that sort of stuff, but I'm going to stick to what I said at the start of the season: Until now, he's never had a truly competitive team-mate. His seven world titles are, in my mind, misleading and I think we are seeing proof of that now he is up against Rosberg. What's more I'm not sure he is taking F1 as seriously as he was earlier in his career. You need a compulsion to be there, you can't just do it for fun, and I don't think Schumacher has that compulsion anymore. To win you need to believe that there is no way anybody else can beat you and, frankly, I don't think he's in that kind of mindset. It seems as though this year is just part of his retirement rather than an extension of his career.
I hear Mercedes has got some big updates coming to the car and a lot of people are saying that will benefit Schumacher. But I think an intelligent team like Mercedes will develop the car to suit both drivers, so I don't see the order changing anytime soon. Rosberg has proved himself as the team's No.1 and he's been faster than Schumacher in all circumstances. That will be an enormous boost for his self-confidence and that will filter back to the team. Earlier I said that Button had joined my top three drivers, but I wouldn't say the same about Rosberg just yet. We shouldn't let our judgement be clouded by the fact he is beating Schumacher as that isn't quite the achievement it used to be"