I see your point mate, but it's not just one moment that's convinced me. The flap against Arsenal was just the capitulation for me. I'd watched most of their cup games last season, and his league games late in the campaign and he's just blatantly lacking in the mental side of the game. Goalkeeping is a confidence based endeavor and if I can see that he hasn't got it, that's bad news.
People talking about his kicking on Sunday, do you honestly think a professional goalkeeper actually can't kick straight at all? The lad was a bag of nerves, and showed it. He was unsure of his distribution and conceded possession numerous times.
It doesn't take an enormous amount of skill to be a decent shot-stopper, but to be a complete 'keeper, one needs composure and confidence to complement his skill.