Agree with this. I have seen Wallstedt have a stretch of very good games and then lay an egg. When he's on, he's on.
I am still a believer in him as I've seen him outbattle the Askarovs/Cossas/etc. in certain games, but I do think there is a little chink in his armor in the side to side movement. He also has nights where he just doesn't know his angles and because he's very much reliant on perfect positioning, when hes off slightly, it's usually a bad night because he's not an athletic goalie like a Fleury (not saying its bad or good).
With all that said, though, he has improved in his time in Iowa. And he's had a shitty team with a super young defense in front of him this year. Give him more structure and reliable D group where he can get into a rhythm and I think he ends up doing pretty good for himself.