Is it legal to use an effect that switches the locations of personalities who are in the same location, knowing that neither will move anywhere?
Switching Location
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Is it legal to use an effect that switches the locations of personalities who are in the same location, knowing that neither will move anywhere?
No.