That take is rather unfair. Doug Christie has a number of advantages that an outsider, say Frank Vogel, would have stepping in at mid-season. He also brings significant professional background.
1) He already knows the players extremely well, in terms of their personalities, and in terms of their strengths and weaknesses on the court. There is a game every two nights starting Saturday night, and no time to waste.
2) He already has the players' respect. He has been there every game, greeting the players every time they come off the court.
3) He already knows the offensive and defensive schemes that the team has been using thus far this season, and can implement changes strategically, rather than wholesale.
4) Christie, by all accounts, did a fine job in Summer League, especially on defense. The Kings' squad was sixth in Las Vegas in opponents' scoring.
5) He has strong opinions, which fans know from his three years as a television analyst.