Nupedia does not need wiki articles.
This will allow each of wiki and nupedia to evolve on their own and act as a quality check in giving two versions of many articles.
Plus, using a 'mature' article from nupedia may stifle creativity in writing the same topic on wiki. This may prevent interesting information from being in wiki articles.
I would like the person who wrote the above to elaborate the sentiment. I know that there are some on Nupedia who feel that way. But there are a few Wikipedia articles that are, frankly, rather better than some articles-in-progress on Nupedia. The fact that an article started life on Wikipedia does not, of course, make it a bad article. --
LMS