Agreed he is not to blame for every goal we concede, there have been some that would have beaten a prime Schmiechel, VDS & DDG.
However, there have been quite a few howlers, and mistakes in positioning, not coming for the ball, failing to narrow the angle, continually beaten on his near post, that it can be said he is 90% culpable for, everyone makes mistakes, but they learn from them, this guy doesn't, I firmly believe that in his head he thinks he the best thing sliced bread, signing for United has somehow convinced him he is world class, and he is far from it.
He is glued to his line
He dives late
He cannot read the game
He cannot jump
He's slow
He does not command his area.