Cannot measure "addressed" by the ranking IMO. I have trust at this point in the staff to only sign players they think can help. Watching the practice clip of Greg taking the ball to the basket tells me that he has the athletic ability if not the polish. BU went out and hired the staff he needed for this position instead of just bringing his old staff (like JG did). He has said several times that this is the best group of players he has ever had and he has been to the dance consistently. I choose to be optimistic.
I do not believe there is any staff that signs players who they do not believe they can help.
Being optimistic has nothing to do with it. We are all optimistic, heck, we have been irrelevant for for more than a decade and we just had a coaching change.
I am very optimistic of Ebo, I think he can help and I believe will be in the main rotation. As I said, every player has a chance to become a star, (including Ebo and Matic) You can say that you have addressed the problem then, but not now, as evident of the many examples, some I mentioned in my post. Otherwise, you can say that you have addressed your gaps every single year, by signing lower ranked recruits at the end of the year. We can do that every year.
Rankings do matter as there are higher chances of success correlated with higher rankings, especially at the higher end. The premise that recruiting rankings do not matter holds no water either. This does not mean that lower ranked players do not have a chance of succeeding (or high ranked players of failing), just that the chances of that happening are much lower.