The 4-person thing never seems to work. They tried it with EE, EE Weekend, and Weekend:NOW.
My mind has drawn a blank. I can't even think of who was on the Weekend editoin of Evening Edition. Steve, can you refresh my memory? 
I actually forgot about the existence of that format myself until I found a tape of it last year. EE Weekend featured Carl Parker, Sharon Resultan, Dave Schwartz, and Lisa Mozer. Within several months, however, the format was broken up as Carl went to weeknight EE, Rick Griffin and Sharon took EE Weekend, and Dave and Lisa took EEWC. Not long after that, Lisa left TWC and was replaced by Sandra Diaz.