I wish the video showed Culver taking 15-20 shots so we could really get a clear picture of any improvements to his form. The one thing that does stand out is the lack of the exaggerated follow through that characterized Culver's 3PT shot last season. The hitch in his form also looks gone, but it's harder to tell from the video.
I really hope the Wolves hang on to Culver. If he does improve his jump shot he will be a really valuable building block since the rest of his game looks solid. I think the long layoff could help Culver more than any other player on the team, since he had one obvious issue that needs individual work in the gym to fix and he has had plenty of time to rework his form.