Packaging workflow: Why bodhi does not have a package?

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http://forums.fedoraforum.org – I am not packager and using bodhi as a source information about packages which I am interested in. If I understand correctly, that the packaging workflow in Fedora (simplified): rpmbuild -> koji -> bodhi => fedora (update) repo. I am wondering is there other way? Why yum has more packages then bodhi? According to yum, currently "updates/18/i386" repository has 14,319+128 packages and bodhi - 9071 stable. Where 5248+ packages coming from? May be I am missing something in Fedora packaging workflow or yum and bodhi count packages differently... (HowTos)