Yeah, I didn't mention in my earlier comment but I've found that scrum does work better with larger teams because it adds ownership into the process. You can define ownership with Kanban (or any process) but it's not integrated into how it operates without some hacking.

edit I sometimes find myself in the position of apologist for Scrum, which is weird because I'm not that crazy about it, I'd almost always prefer to use something less heavyweight. But people are so quick to throw out the baby with the bathwater - there are a lot of great concepts in scrum, and it's quite interesting to see how all the parts interact when it's actually working.