You think, but your numbers are skewed by a really good year two seasons ago which doesn't/didn't help us this year, and a poor year before that one as well. Maybe he turns it around like you think but he had a bad year. His numbers show overall he is pretty good, but that doesn't take away he's let in some really soft goals this year and I'm sure it affects the play of the team and their confidence in him.
The numbers aren't skewed anymore or less then any of the other goalies on that list. All played a similar amount of games. I am sure you could say the same for any number of guys on that list:
Last 4 years
Holtby .925, .922, .907, .911 so two elite years, one poor year and one below average year
Rask .915, .915, .917, .912 So he is consistently average
Rinne .908, .918, .927, .918 So two slightly above average years, one poor and one elite year
Lunqvist .92o, .910, .915, .907 So one very good year, one average, two below average
Helle .918, .907, .924, .913 One elite year, one poor year and two average years
I think you get the point, almost all goalies have large variations in their performances year to year. Only Rask shows consistency between years