Spoilers for Maul Shadow Lord
By the time of MSL (which appears to be pretty early in the Empire's reign seeing as they're still using LAAT/i gunships and the early stormtrooper armor, Maul has a very small amount of people on his side. He has Rook Kast who genuinely seems devoted to him as Mandalore along with a handfull of Mandalorian mercenaries.
I want to talk about Maul's relationship to the mandalorians. So during TCW he takes over Mandalore, challenges Pre Vizsla, claims the darksaber and all that. Then Sidious shows up and beats him up. For some reason Sidious doesn't kill his "rival" and former apprentice even though this breaks the Rule of Two.
I'm a bit lost as to what happens next. Somehow between then and the last season of The Clone Wars he's back but without the darksaber and he's back on mandalore?
And now in Shadow Lord he has Rook Kast who is loyal, and a handfull of mercenaries who only care about money. What happened to the old death watch "lets retake mandalore" folks? Why do these guys have no loyalty to maul?