Katee Sackhoff breaks down why Bo-Katan taking the Darksaber with the intention of leading Mandalore in The Mandalorian season 3 is different from the other times she has tried to carry that mantle. Bo-Katan has held the Darksaber before, but this is the first time she has earned it through combat. In Clone Wars, she was given the throne of Mandalore after Ahsoka had defeated Darth Maul, and in Star Wars: Rebels, Sabine Wren handed the Darksaber and the responsibility of leading Mandalore off to her.
https://screenrant.com/the-mandalorian-katee-sackhoff-bo-katan-lead/