Cosby Kid Found, Different than You Remembered

I was flipping channels at home, waiting for dinnertime to roll around, and I came across the Motown 45 special. This lady was singing Stevie Wonder, and it turns out she used to be little Olivia on the Cosby Show. My goodness. It brings up the point, though: if we can have Motown 45, why can't we have Cosby 20? They could do one of their songs that they all lip synched together, we could reminisce about when Denise made Theo that yellow shirt, and we could learn about the cast members 20 years down the road. I wonder what Vanessa and Rudy are doing? Was anyone less likely to have a post-Cosby career than Vanessa, or more likely than Theo? How come he isn't a star?