If you had everything go through two or more "feeders" then it would be harder for the enforcers to control the whole chain. Also, what if everyone just appeared to be a feeder. So a feeder doesn't know if the message it's receiving originated from the sender or is just being passed on by the sender. I'd imagine this would result in a pretty slow protocol. If I'm not mistaken this is kinda how Tor works though.
Yes, I'm beginning to see the problems with this scheme, particularly with speed and scope. Looking at Tor, I see that it is, essentially, the same concept.