Your Idea's are spot on.
Lakers are going to be severly lacking in transition D, but there half court D is going to be pretty damn good, plus Kobe will be more effective defensively than ever because he can rest even more on the offensive end, because of the support offensively he will have with not only Shaq, but Gary and Karl.
Getting rough with them may help, some hard contact games against the old blokes cant help ther health and bodies.
The key is they will still have to double Duncan often, so it will be the familiar story of our perimeter players performing in all aspects of the game that can kill LA. But there only real glaring Weakness seems to be there Transition Defense, and perhaps there 3point shooting.
Pretty daunting task to beat them this season if they get both players.