Group ID Changed During Mac OS X 10.5 Upgrade

I have just discovered that my Group ID was changed during the upgrade from Mac OS X 10.4.10 to Mac OS X 10.5.
Prior to upgrading, my User ID was mcc and my Group ID was admin. After upgrading, my User ID remains mcc but my Group ID has been changed to mcc.
Ownership of files in my home directory hierarchy were changed to mcc:mcc. Ownership of files in other directories were not changed and retain the old mcc:admin ownership.
Under "classic" Unix ownerhip rules, I still own the files. However, there seems to be change in ownership policy under Mac OS X 10.5. I cannot make any changes to the files because they are in the "admin" group.
This change has a significant impact on the value of Time Machine as it prevents it from being used to restore system files that have been corrupted. Why is Time Machine backing up all files when there is no mechanism for restoring files other than those in the user's home directory hierarchy?

Given the above, I would expect to be able to modify, change, or delete any file with ownership set to mcc:admin without using sudo.
Agreed.
Actually, the more interesting question is why was group mcc created.
Yes, perhaps for backwards compatibility if you did an upgrade...
I don't recall it as existing in earlier releases of Mac OS X.
Because I think the opposite is true. Tiger, at least, always created a group for each user, with the same name and with gid=uid. It is Leopard that uses the staff group instead of a unique group per user.

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