There's been a lot of posts about how Moff Gideon is appropriating Mandalorian culture that I've found extremely interesting. Even Giancarlo Esposito pointed out that this isn't just a matter of simple exploitation: he wants to be a Mandalorian.
"Moff Gideon would really like to be a Mandalorian, and there’s a reason for it. That’s his psychological, real problem. He really wants to be a Mandalorian because the strength and power of the Mandalorians is not necessarily that they are individuals. It’s that they are part of a group that have an ideal and a morality."
His new armor even has the ka'rta beskar on it, so it's really not just that he's stolen beskar alloy to make himself a cool set of armor: it is Mandalorian-style armor specifically. However, it's also armor based explicitly on the armor of Death Watch Maul loyalists.
It's reasonable to conclude that Moff Gideon would alike himself to Maul, an outsider who was able to inherit Mandalorian identity only through the possession of the darksaber. He would see Maul as a legitimizing path to Mandalorian-ness. I could easily see him idolizing Maul.
Bo-Katan - who rejected Maul instantly - would indeed be someone that Gideon would wish to destroy, but not by killing her. He once mocked Bo-Katan for needing the darksaber to legitimize herself, but his glee wasn't simple cruelty. He was delighted that she was legitimizing the darksaber itself, which in turn would legitimize him if he possessed it.
I think it's also telling that the episode goes out of its way for Din to say that no, the darksaber isn't important, and the belief that it is is a disservice to us. The darksaber isn't really what makes Bo-Katan a good leader.
Moff Gideon wants to be a Mandalorian, but like any fascist who appropriates another culture, he is only able to engage with the symbols and artifacts rather than engaging in a deep, life-long commitment to the culture and identity itself.
honestly hilarious how gideon did all that because he wants to be mandalorian when the mandalorians are possibly the easiest culture in the galaxy to join. literally all he had to do was show up and be like 'hello please adopt me' and there you go.