I don't think LA's fate has much of an impact on an assessment of the trade. I think, and have always thought, that the key to our defense is defending the paint. That's the case whether we're defending it against post scorers like Gasol and Randolph, or from penetrating guys like Lebron, Wade, Rose, etc.
Now, if Green focuses on defense and energy and provides timely scoring, then I think he can offset some of what Perk brings. However, I'd still feel better with Perk in the middle, giving us 48 strong minutes at the center position along with JO and Shaq.