1)
Why is he called "Re'eh David"?
1.
Radak: He is his beloved close friend.
2)
What is the meaning of "Yavo Yerushalayim"?
1.
Rashi: He decided to come to Yerushalayim.
2.
Radak: At the same time that Chushai came, Avshalom entered Yerushalayim.