Update ...
Smith has his stiffness of opponent drop quite a bit for 5 and 10 games, but also burns off his last rough start (Minnesota game) in the last five to spike his save percentage in that time period.
Code:
Player # Last 5 Last 10 Last 15 Last 20 QS%
Smith 39 0.929 0.924 0.914 0.903 51%
Opp 0.488 0.519 0.534 0.537
Rittich 42 0.920 0.895 0.896 0.898 62%
Opp 0.545 0.545 0.543 0.541