[Spacewalk-list] Oracle Linux 6 repo not fully synched?

[Coffman, Anthony J]

I'm starting to sync Oracle Linux for the first time and I noticed this happening

Sync started: Wed Mar 13 16:05:44 2013
['/usr/bin/spacewalk-repo-sync', '--channel', 'ol6_latest', '--type', 'yum']
Repo URL: http://public-yum.oracle.com/repo/OracleLinux/OL6/latest/x86_64/
Packages in repo:             20868
Packages already synced:          0
Packages to sync:             16519
1/16519 : tk-devel-8.5.7-5.el6-1.x86_64
2/16519 : tk-devel-8.5.7-5.el6-1.i686
3/16519 : totem-upnp-2.28.6-2.el6-0.x86_64

<SNIP 16000+ packages syncing)

16518/16519 : kernel-devel-2.6.32-358.2.1.el6-0.x86_64
16519/16519 : kernel-doc-2.6.32-358.2.1.el6-0.noarch
Linking packages to channel.
Repo http://public-yum.oracle.com/repo/OracleLinux/OL6/latest/x86_64/ has comps file comps.xml.
Repo http://public-yum.oracle.com/repo/OracleLinux/OL6/latest/x86_64/ has 1148 errata.
Sync completed.
Total time: 9:39:22

I don't understand the discrepancy between the 20868 packages that are available in the Oracle repo but only 16519 are selected to sync.

I found that Daniel Schindler had also mentioned this in a tangentially related bugzilla from a few months ago
https://bugzilla.redhat.com/show_bug.cgi?id=860860

I'm digging through the source now to try to understand this but I haven't found any obvious filtering going on.

Cany anbody shed some light on this?

Regards,
--Tony