Anything that requires manual policing causes a problem with avaiable people to police it, and complaining its unfair because of unbalanced enforcement caused by lack of people to police it.
X got caught but Y didn't!
Enchanter mark is already manually policed. The "possession" rule is the least problematic abuse, as deceptive marks and offensive marks do more to ruin game play and atmosphere. And it causes this problem of a character name being a word and then that word can't be used in marks.
I really don't see a rational justification for that "automatic policing" when the spell has to be manually policed anyway.
