There is a tendency to assume whatever you were is what you will always be. Lyon was actually the perfect candidate to elevate to a starter's role. Peak age, experienced, shown flashes of greatness over his career.
Let's also not forget my mantra about defense: it makes goalies play better. And the Sabres are playing mostly good defense now. In these 5 games how many jailbreak rushes have the Sabres given up? Now think about the past two years? Even in the first 3 games we have reduced the number of high danger chances by the opposing team. Penalty kill, while still early, is the best in the league. That's a huge corner we've turned.