The lads confidence was probably shot to bits by having a slap dash defense in front of him for half the season, but again that's what you get for having an inexperienced keeper in a relegation battle.
He may well go on to bigger and better things like Jordan Arhcer but we have still paid the price for putting faith in a young inexperienced keeper.
Interesting that you mention Archer. I was behind him when most on here couldnt see any positives in him.
Drilling I remember was particularly damning of him (sorry Drilling!).
Can't remember now who he was sparring with for the number one spot at the time?
For me there is a huge difference in quality between Archer as was and Mitchell as is, although I would say one redeeming feature of Jonathons that he shares with Jordan is occasionally he will produce a good instinctive reflex save.