There really hasn't been that much forking. FreeBSD, NetBSD, OpenBSD, DragonFlyBSD and Darwin being the only existing operating systems. On top of that, they are complete operating systems with a user environment and kernel. You can't directly compare them to "Linux" which is only a kernel. You could more accurately compare them to Linux distributions (FreeBSD <=> Ubuntu). When looked at that way, the "fractured" community looks less like BSD and more like Linux.