I agree with this. Frankly, I wouldn't use a one-game sample to make a conclusion about Ryan Kelly, either (although I do think he played well).
However, I'm less hesitant to use one or two game samples to dispel conclusions about a player. In other words, if someone says "player X was terrible" and then I see player X had the best plus/minus on the team, I'm willing to say perhaps he wasn't so terrible after all.
And obviously that's what I think about Mason's play in the past two games.
Not a good game to go small:
2 guards, Singler, 2 bigs +18
3 guards, Singler, 1 big -7