The Sabres have lost 13 games by giving up 4 or more goals. They only have 2 games where they scored 6 or more so that's not really inflating their totals much. You are arguing that without a player like Peterka we simply are not scoring enough. We are scoring enough, but we cannot and have not for years been able to stop other teams. We needed a 20% reduction in goals against to make the playoffs, right now we are on pace for 291 goals against, 2 more than the 29th worst Buffalo Sabres were last year. TBF I ran the numbers the other way as well, we are running at a 249goal pace which is 20g less than last year. So Buffalo is actually worse at allowing goals (because the goaltending is ATROCIOUS) and they aren't scoring as much as last year.
Half of the Eastern Conf playoff teams last year were close to 249goals (252, 242, 245, 243) but 0 of them were anywhere near 289ga. The closest was Montreal at 265ga and no other playoff team in the East was over 234ga.