Is it impossible to get NCV the third week of August thru II using a 2 bedroom Marriott Grand Chateau Easter week? I just put the request in few days ago so about 11 months prior.
Not entirely impossible — but unlikely at this point, in my opinion.
I assume you're trying to get August 2016, not 2017. Also, I assume you're using II, and a Points reservation is not an option for you.
The weeks calendar for Newport Coast Villas has almost the entire second half of the year as Platinum, but most Platinum owners want July and August weeks. Weeks owners have learned (often the hard way) that they need to call in right when their 13-month or 12-month booking window opens.
It's now September 2015, so it's safe to say that all August 2016 weeks have been booked. Most will be used by owners who want to take their kids to Newport Coast before school resumes.
Undoubtedly, some weeks were booked as valuable exchange weeks, and it's likely that most of those weeks were deposited with II right away (and have already gone to fill ongoing requests). There is probably a long queue of ongoing requests that are unfilled, including requests from Newport Coast owners who were only able to get September weeks and want to exchange them for August.
The only August 2016 weeks that will still go into II are weeks from owners who change their minds about going in August 2016 or who are waiting to make their deposit because they want a later expiration date on their II Accommodation Certificate (even thought trading power eventually goes down over time). There's also a tiny chance Marriott could put together weeks from Points inventory to get other high value weeks to use for Points exchanges, but I wouldn't count on it.