Should be but it appears there is still an issue with array drives showing up in preclear. I disabled the diskinfo in UD until @gfjardim finished the diskinfo daemon. I have been testing his latest version and it appears that he has sorted out the issues. I'll issue another UD update to re-enable the diskinfo daemon once I am convinced the issues like you are experiencing have been solved. UD and preclear should always agree on the drives that are unassigned.
If I recall, you had drives show up that were in your array. Be sure you have the latest version of preclear and if the disks still show up, download the preclear log and post it on the preclear thread so @gfjardim can see the issue.