
I think only the djm can be used as the master for the criteria - there was some dsicussion about it (try to search the forum) but the rekordbox doesn't show related tracks based on the master player and tbh it works best with the rekordbox dj then with the linked cdj. The "list" shows matching tracks to the currently selected tracks in the rekordbox and the collection or playlist drives where the rb looks for the matching tracks - if in the current playlist only or in the full collection.
Only the tracks matching the key are marked green on the player - not the tracks matching the "related" criteria.