NEEP HELP ASAP

Hi i have three questions that i need answered...hopefully somebody can help me!

ok number 1 is does anyone know the significance of Mr. Gatz's appearance and his feelings about his son at the end of the novel???

number 2 is when the narrator states, "i can see now this has beeen a story of the West after all" what does this mean... can anyone give me examples from the book.

at the last one number 3 is does anyone know the significance of the green light, always visible at the end of Daisys peir. and if anyone has any examples from the book again that would be great..

thank you to who ever helps me.

God Bless You