Last years cavs squad was remarkably bad defensively pretty much across the board. Nance Jr was the best net defender, being the only player to carry an above average PER and hold his opponents under average at a position he actually played most of the time. Dean Wade nearly made it at PF as well. But pretty much everybody else was a turnstyle, including Tristan..
So this year we have Drummond and McGee who are at least PER positive at center and IMO we should pay them there with Love at the 4, relieved by Nance or Wade, and with Nance claiming some minutes at the three. Obviously Okoru and Windler will play at the three, but I would be surprised if either of them were net positive in that position early on. If we ran Sexton at point and Dotsun, Exum or even Osman at the 2, that should be our best line. In order for anyone else to reach par, they are going to have to take a major step forward. Garland and Porter were both defensively challenged last year, and Windler did not play enough to know. We experimented with Porter playing the point last year, and we might give that another shot, unless Garland breaks out.
So net net, we are not much changed since last year. The improvement if we get any will be because somebody we already have got better, and especially at defense.