Numbers are meaningless :-) What's your interpretation?
Has SpringSource hired all the original committers? Does the rest of the world consider Tomcat "good enough"? Does SpringSource have too much time on their hands? Is the rest of the world incompetent? Has the rest of the world moved on? And since my employer is constantly accused of it: is SpringSource trying to gain control over Tomcat?
No, SpringSource is not employing all Tomcat committers. This statistic is a result of SpringSource buying Covalent, the leading provider of Apache support. Obviously SpringSource cannot "control" Tomcat or any other Apache project as those projects have to have committers from more than one company. You might also want to read http://feeds.feedburner.com/~r/Interface21TeamBlog/~3/371586937/ .
Tomcat is also far beyond "good enough". If you look at http://it-republik.de/jaxenter/quickvote/results/1/poll/22 you will se that it is the leading platform for Java applications - and according to other polls it is far more widely used than any Java EE application server.
Bottom line: SpringSource does more than Spring - we also support the leading platform for Java applications. And we do a lot of the development of this platform...