This team has not been good at defending shots from passes across the slot line.
You also have the issue of a goalie learning to play behind a new team. There is an adjustment period. Ullmark in Boston is a decent example. He is markedly better this year after having a full season in Boston behind him. I do not think that is a fluke.
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And then you have the challenge of landing a goalie that is playing well. Only one of the top 10 goalies in the NHL this season in GAA Better Than Expected moved over the summer.
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And when it comes to Demko, trading for him isn't guaranteed to improve the Sabres goaltending this season. He is playing worse than all three Sabres goalies so far this season. And he's hurt. And if the Sabres trade for him, there would be an adjustment period.