Cech was a world class keeper. He just makes too many boneheaded mistakes now. So while he's still very good on his day, I expect to see Courtois between the sticks at Stamford Bridge in the not-too-distant future.Honestly though, you could make a graph like that for pretty much every national team: England, US, France, etc.
I agree that he's one of the top passers in the game. But he's a defensive liability, is riddled with injuries in his old age, and honestly I just don't see ManU going for him. That would mean, if he wanted to go back to England, playing for a different club (something he said he'd never do).