On Star Trek: Discovery Season 3 Episode 11, Dr. Pollard (Raven Dauda) reports on Book (David Ajala) when Burnham (Sonequa Martin-Green) and Grudge (Leeu/Durban) come to see him
Burnham: I'm going with Saru and Culber. Book: And Saru worries you? Burnham: I'm not sure he can be objective. How he'll handle it if he has to make a hard call. A painful one. One that costs him. But that's what it means to be a captain.