Isn't there a plot hole somewhere? I thought JD left to go be near his son, and now he's back teaching? I know ZB isn't going to be on every episode and they have plenty of time to bring up why he's back, but him being back doesn't make a lot of sense.
Oh well, I mainly only started watching it because it's in reruns about 20 times a day so I've never really followed the storyline very closely. It was a funny show but it seems they have gotten to that point where it's obvious they should put it down yet they keep eeking out shows. Like That 70's Show Season 8 without Eric and Kelso.