I am a UU, and I had actually never heard of 4 of these people. Each person has about 10 pages dedicated to them, so it is not an intensive study of their lives but points out the (sometimes dramatic!) high-lights. In some places the childhood stories read a little melodramatic and are obviously conjecture, but not infuriatingly so. If you are a first gen UU I must INSIST you read it.
Oh, there's a type on page 5: othere should be others.