[[Brewster-4]] is the one most needing to be cleaned up. It is going to have the most impact on other people because of the number of people connected to it - the longer it sits with problems, the more confusion and errors will be made in other places.
It's also the more complex of the two. [[Carver-458]] may be cleaned up with minor additions and corrections, nips and tucks made by people. He has a bio - and if he needs more research, that's going to take a lot of time.
Brewster needs more intensive surgery not as much because of his importance (I think all of these people are important and interesting!) but because of the impact of errors and things omitted on his many descendants.
Brewster should get work done!