No, I don't misunderstand at all, but it seems you do. Of course not every goal can be blamed on Cornell, just the same as they can't for any other 'keeper. Cornell's stats are there to be judged against the other teams, and they don't look good.
And I'll point out again, our defence had the joint 8th best opposition shots on target record in the league last season (which shows they protected the goal a lot better than many believe), yet the 17th worst goals conceded record. Our defence made mistakes last season sure (I thought Buchanan and Taylor were equally as poor as Cornell at times), but it's a fallacy to assume that many (the majority?) other teams did not make plenty of costly defensive errors also.
As to the bold, I never said that. I said that his save ratio stats were the fourth worst and that he was one of the worst performing goalkeepers in the league last season (on this metric at least).
Yeah, but like we've said the metric is flawed. Unfortunately it seems you cant see that.