If you define it as greatest Kings careers and not just who are the best ten players to play for the Kings, Brown is easily in the Top 10.
He is this generations Dave Taylor, except he lifted the Cup 2x and was a ridiculous force in the 2012 run.
Brown/Kopitar/Doughty/Quick are all in the Top 10. All four have played their entire careers with the organization and have been key contributors to two Cups.
Dionne/Vachon/Taylor/Gretzky/Blake/Luc. There are your six retired jerseys. The four current players mentioned will have their numbers join them in the rafters.
There's 10. Nicholls was more talented than Brown. Palffy might be more skilled than anyone I've mentioned save for Gretzky. Longevity--coupled with results--matters.
You can probably get me to remove Blake just because of my feelings towards him, but he's the best defenseman this team had until Doughty came along. Ditching the "C" is grounds enough for me to remove him for Doug Zmolek but I'm using my brain and not my heart.