He's never really had a good spell though has he? I think you're missing the point completely by even bringing him into it(the point was they wont need to have disastrous performances consistently if they are English), I've seen it too many times now with English players sold for big fees. I've also seen City fans following it like sheep saying Sterling is shit for example and then being completely stumped when they see how his stats line up against the rest of the best. They will be on him from the first mistake(where as a de Gea will get criticism but they wont be making a tally of them for a highlight real months down the line), even the strongest willed players will let it get to them sooner or later and it can have a drastic effect for a goalkeeper, they can't really afford to have low confidence. He's not an experienced keeper so he will have his lows and have to overcome them, we don't know how he will react to it, especially with the added pressure of a bigger club.