Another great post!
I like your choices, particularly for OH. I would personally go for repeat of last year's VNL in letting Aleksic continue to rack up experience on the biggest stages (she showed very much that she is not among the very top of our roster in terms of dependability at WCH, so no need to rest her). Popovic is a known quantity, and you know exactly what you'll likely to get from her, in both good and bad ways. One of the main question marks is Lazovic. Two years ago she looked a clear-cut leader among all players younger than 1997. Last year, she was the player with the greatest regression (to the point that she looked to be absolute least useful member of WCH squad, even behind Jegdic).
As for bolded, I think that's exactly the right strategy, and why Uzelac and Tica MUST play the whole VNL, regardless of how the rest of the squad will look like.
Talking about Lazovic, i see her as vice Busa, her time will come with experience but she have a heart. Dont forget that she was on court on match points in final and semi final.
About Aleksic, you are right that she need less rest, but for other reasons, she and Valefoglia will finish season much sooner than other core players.
But i think you are wrong about other staff, she is our core player and with Boskovic and Lozo she will be main player in the next 5 years. I heard she was sick in last few games during WCH. But in general she played pretty good during whole summer.