If you're having issues with FCP not consolidating a library, you can recursively search the library for files that are aliases, and are linking to certain directory or volume.
This will find anything in the home directory, ~/Desktop, ~/Documents, etc
cd "~/Movies/My Library.fcpbundle" find . -type l -ls | grep /Users/darren/
This will find anything linked that's on the volume "14TB"
cd "~/Movies/My Library.fcpbundle"