I think the CV's have spent a lot of time telling us the story of RK for us to accept the way he was before was due to the circumstances of his father's death and his step family's entry into his life. Just so we can start to warm to the character. So all our expectations would be dashed if they were to turn him bad again.
Also it will be a waste of months where they developed RK's character, if they were suddenly to turn him back to the way he was when he was first introduced. I think RK will remain good, they will be some ego clashes as he should retain that arrogance that we love but that's all.