Toledo, as lidstromiscool has said, is a wretched team. Especially at lower levels, a wretched team can make a wretched goalie performance. I think far too often people with absolutely no sporting acumen look at small samples and say "Oh, this is super concerning" or "Oh wow, this guy is incredible!" and it's completely the wrong call. In a position where it is notoriously team dependent (unless you're a magician like Dominik Hasek) and one that has a very clear maturation period that must take place, I don't see the need. And this isn't the fact that I'm a huge Cossa guy getting in my mind.
Cossa played on MFing stacked Oil Kings teams and now he's playing on an exceptionally bad Walleye team. It's part of the learning process. Not only that, the Walleye are playing him like every night.
I'm sure they wish he was churning out .950 sv% nights on the regular, but for now, they literally just want him to play and play a lot. We are not in a position where we need Sebastian Cossa to be a Red Wing playing 60 games a night for another several years.