Injuries really hampered him last year. When he was healthy the previous year he was very solid. Question is can he be durable.
That
is a good question.
As for him being hampered last year, I had trouble seeing it.
BUT, having said that, I don't know how you could
help being affected by a left meniscus tear followed by a right plantar fascia tear, especially for jumping off the right foot. (I'd guess that the second injury was not unrelated to the first.)
His production did not seem to suffer, though, with the possible exception of defensive rebounding, which was already not great for a center (btw he may "be" a 4, but he "plays" 5). One of Rozier's seldom-recognized contributions was his defensive rebounding, which was remarkable for someone at his position - but after all, you would still expect a big like Theis to do better; but Terry edged him out. On the other hand, his offensive rebounding was still very good, so the leg issues can't have had much of an effect.
You'd expect knee and foot stuff to hurt shot-blocking more than anything else (maybe charges taken?), but Daniel was the same excellent shot-blocker in year 2 as year 1. He fouls too much, but barely more in year 2 - call it a wash because of the sample size.
On the plus side, two huge improvements in his game came in his second season: he drastically cut down his turnovers (went from catastrophic to excellent) and dramatically increased his 3-pt%. If your third big (maybe second, at least until RW3 comes online) takes good care of the ball, blocks 4+% and shoots .388 from deep, you are pretty solid.