They simply couldn't squeeze him into the episode, so they didn't show him.
I used to watch LA Law, and would be frustrated when regular characters I was partial to, would show up in the conference room briefings at the start of the show, and then would disappear for the remainder of the episode. That cast grew so large over the seasons...I know contract performers have to appear in ''X'' number of episodes, but if they weren't necessary for that week's plot, I often wished they could avoid shoehorning them in just to be seen for a few seconds.
Dazed and confused over high tech.
Sigh...Concrap. The Internet Overlord Cometh
They're not com-tastic!