Have you seen the competition he's up against, it's far from stellar, refuse to believe Krul has fallen so far, he failed at Ajax because he started the season still injured and the stand in took his chance to shine, he wasn't a complete disaster of Twente from all accounts.
Anyway since we are discarding him, not sure what Rafa sees in Elliot above Darlow, I would even give Woodman a chance ahead of this guy.
He was a disaster at AZ though, the club he was playing for.