(obDisclosure: I'm a former employee of Canonical and still an Ubuntu Core
I'm curious about the Debian/Ubuntu numbers in relation to one another.
How many of the Ubuntu contributors were contributing upstream before, and
are now simply associated with Ubuntu instead; How many of the Debian
contributors or contributions are paid for by Canonical.
My experience in doing stuff for Ubuntu was that the people contributing to
upstream tended to be the people who were doing it anyway, so made it a
part of the work that they were already doing. Those who weren't already
contributing upstream rarely started to do so.
Ubuntu hasn't managed to grow a culture of contributing upstream, even when
they tried directly to do so. It just somehow never worked out. Having
been there, I don't know what the right way to do that is.