Well you heard it here first, shut down the thread for 2-3 years then we can actually talk about him !
Ignoring the blatant misrepresentation of what i actually said (fretting about single games), that does seem more productive.
At any rate, Im all for having a discussion but you will drive your self crazy fretting over each increment (ie. game) of development.
For my own curiosity, I took a look at the top 10 goalies (by sv%). Obviously a random sample but reflective of the goalies playing best right now.
1) Linus Ullmark, 6th rounder: Had multiple U18 seasons with a sub .900 sv% but has shown somewhat steady progression as a pro with several flat seasons in the low .900s.
2) Pyotr Kochetkov, 2nd rounder: shown somewhat consistent development with several middling (.906ish) sv% in the KHL.
3) Connor Hellebuyck, 5th round pick: steady linear progression
4) Ilya Sorokin, 3rd rounder: who has actually had a very linear progression
5) Matt Murray, 3rd round pick: posted 3 consectuive sub .900 seasons in the OHL (including his first 2 after being drafted). Obvioulsy won some cups with the pens but has since posted back to back sub .900 sv% before rebounding again.
6) Craig Anderson, 3rd draft pick: who went unsigned. Was redrafted two years later and posted a sub .900 sv% in his only ahl season before getting an opportunity in the NHL
7) Alexandar Georgiev, Undrafted goalie: who posted a .904 sv% over two ahl seasons before permanently establishing himself at the NHL Level
8) Darcy Kuemper, 6th rounder: posted a sub .900 sv% in his draft year. Had a worse D+1 year in the WHL than Cossa.
9) Ilya Samsonov, 1st rounder: He has shown steady progression however lets not forget washington was looking for a permanent option in net felt they couldn’t trust him. so let him walk to UFA despite his (mostly) steady development.
10) Filip Gustavsson, 2nd round: Good in the SHL then had multiple sub .900 sv % Seasons in AHL & ECHL for multiple seasons
(Bonus random sample) Martin Brodeur, a 1st rounder who posted 3 consecutive sub .900 sv%s immediately after being drafted including 1 in the ahl before putting up a .915 in the NHL.
Lots of different paths that had their individual (year to year) fluctuations and in several, cases non-linear development. I believe the youngest player on this list (excluding Brodeur) to debut at the NHL was 23 years old (demonstrating the required lead time for goalies). Keep in mind, hockey is, statistically, the most random major sport and goalie is the most random position within that sports.
So yea, stressing and nitpicking each game is just too in the weeds to glean much. His season as a whole? Not good, but that has happened to plenty of quality netminders (see brodeur, who was worse in junior hockey than Cossa).