Questions about "Grey's Anatomy"! urgent! angry!

It is said that he will not come back. There are external reasons for his departure, because he has conflicts with the actor who plays George and has made discriminatory remarks about homosexuality (the actor has admitted that he is gay). This dispute has caused quite a stir. It was quite lively, mostly in support of George. In the end, George stayed and Burke left, so the writers had no choice but to arrange it this way

In the third season, I feel that George is different from the first two seasons, and he is always very sad

The fourth season has added a new character named Meredith’s sister (appeared in the last episode of the third season, a new intern), and it is said that she will develop with Derek.

There should be more There must be another character appearing, otherwise what will Christina do?

The final question, of course Burke loves Christina