The Frisian Freedom gave DuPrix the fief of New Ada Kulun for three reasons:
1.) We didn't want the fief. It's strategically pointless to us.
2.) We didn't want to just give the fief back up to Hospitaller. They don't deserve it with the half-assed commitment to Strategus they displayed.
3.) We always are trying to encourage more factions to play on Strategus. Giving one a fief is a great way to start. It certainly worked for Frisia after we acquired a fief.
It appears Occitan/Hospitaller have no intent of taking this fief, but if they did we would consider the Kingdom of DuPrix a protectorate and would re-acquire the fief for them.