They never ever played fully healthy last year. Even when they all came back it was what for a month or two? D Lee went out early in playoffs if i recall. I know he returned but that was more of a emotional thing
They had stretches where they had the full starting 5, but in general Bogut was still recovering and not healthy over the first half of the season. Honestly besides Bogut and then Lee going down in the playoffs this was a very healthy team last year (Brandon Rush tearing his ACL 1 week into the season aside)
Klay started all 82. Steph played 78 (he has only had one season where he missed significant time--- the lockout shortened season. His injury proneness is highly overplayed by many). Barnes started 81. Lee started 79.
Bogut was never truly healthy all of last season. Management flat out lied saying he was fully recovered from offseason ankle surgery going in to last season, truth was he was barely even a month removed from surgery coming in to the year. Now he is more healthy than he has been in years and has been working out with the Australian national team looking amazing.
At this point I can't rule out a trip to the Finals, especially with OKC regressing. I don't think we could beat Miami, but beyond that, sky is the limit