Do you know why Eve Plumb wasn't in the picture? I know that she wasn't really "into" coming back to guest star on Brady special reunions on television, but I never knew the reason why.
I don't know why. I imagine she is just not as passionate about her early 1970s life as some people are. However, I do think she shows up more than people think. (Trivial Pursuit, 35th anniversary special, etc) and is just pretty selective about it.