I should probably clarify my statement. Multicore contains a plethora of extensions, no one, I repeat no one, would need every extension contained therein. All of the extensions on Multicore are a snapshot of what is in the repository. They are there primarily to help get net access.
The extension versions in the repository will always be equal or better (newer) than the snapshots provided on Multicore. If you have net access then there is no real reason to use Multicore.
Note too, that by deploying a cde does not negate the possibly of having a copy2fs.flg, or copy2fs.lst in the cde directory in which case a cdrom (iso) containing a cde would be capable of unmounting.
Multicore does not use the copy2fs feature as, given the number of extensions, it would be too high a burden on ram usage.