Well I echo your questions about the dark saber. I mean she was able to easily wield it. I think I remember seeing him put it back on when he was sorta getting dressed after she rescued him. I am not sure it can be relinquinshed other than direct combat though. I am a little fuzzy with this dark saber thing. Good question though. I think we can all see she gets it back. I am not sure Djinn is ready to lead the whole thing yet?
We have to remember a simple fact about the Darksaber that's been overlooked from Rebels...
This is not just a weapon. It's a cultural artifact. It's a symbol capable of uniting ALL mandalorians under one banner. It was wielded by an ancient Vizsla relative - the first and only Mandalorian EVER inducted into the Jedi Order - Tarre Vizsla.
It more or less chooses who wields it and it can only be won thru combat. Sabine's struggles when sparring with Ezra and being taught by Kanan Jarrus (Caleb Dume) and Fenn Rau.
If you handle it unwieldy (much like Mando did when fighting the mutant creatures - Alamites) it's the same as when Sabine was weilding the Darksaber during her struggles. It's known to be "heavy." As one connects with the blade, it becomes "lighter."
Kyber crystals are somewhat semi-sentient. They choose and bond with the Jedi who find the crystals......you experience this first-hand in Star Wars Jedi Fallen Order:
Mando seemed to struggle using it where Bo Katan did not. Which begs another question - does the blade recognize former wielders? Based on how well Bo Katan utilized the weapon during this fight, I would argue that it does. I think there is strong evidence in the canon to support my assertion with lightsabers/kyber crystals choosing their wielders. From the OT, Clone Wars, Rebels, Sequels, etc.
We also got our very first LIVE ACTION appearance of the Mandalorian gauntlet shield. Mega cool!
I guess I've done much more watching and re-watching of all of this than I care to admit.