Oddly enough, considering the big deal made out of casting James Spader this season, what this week's episode of 'The Office' (Thu., 9PM ET on NBC) proved was that they really don't need him to succeed. The ensemble is so strong by now, they're holding the show together just fine.
That said, Spader in the capacity we saw him this week was perfect. He's there to inspire and terrify the office, and keep everyone on their toes. But Andy has stepped up beautifully into Michael's shoes with a completely different but equal level of awkwardness.