There are no other significant contributors. I consider that "working mostly alone".
Nope, that is changing the wording to suit yourself. He started the project and is able to work full time on this.
A Mageia packager contributed some very good patches towards systemd. He's not in the email on debian-devel, while he monitors systemd , works with Lennart and others, etc.
See his other email: http://lists.debian.org/debian-devel/2013/05/msg01367.html
Our Mageia packager is not included. One of the patches he wrote: During the development of the journal he fixed a really important journal memory bug. Took a lot of effort to figure out, etc.
But the arbitrary '100 patches' is introduced. Seems rebuttal is pretty biased.
PS: Upstart has had 17 contributors. Systemd has 15 people with commit access. Systemd seems way more viable.
Obviously he started systemd and works full time on it. Then loads of other people work on it as well, but not nearly the same amount as he does.
Kind of sad to start name calling when you're not clear about this yourself.