"For who is more important ... serves?" Jesus uses this question to begin to explain to the apostles who is truly great. Alternate translation: "I want you to think about who is greater ... serves." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Jesus uses another question to teach the disciples. Alternate translation: "Of course the one who sits at the table is more important than the servant!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
"But I am with you to be a servant" or "But I am with you to show you how a servant acts." The word "yet" is here because there is a contrast between what people would expect Jesus to be like and what he really was like.