Statistically he really isn't that much different than he was last year. I mean look at his rates. His DRB% is up, his STL% is up, his AST% is the highest in his career, his TOV% is down, etc. He is shooting slightly worse from 3 and significantly worse from 2, but he is getting to the line more frequently and hitting those better.
All of that makes sense when your team loses 3 of the greatest offensive players in league history.
Draymond is 29 and in his 8th year in the league. Now maybe his minor injuries have taken a toll, but it would be pretty early in a career for a guy to drop off physically without an injury. I think his stuggles are really just a factor of the team losing so many great offensive players. Nothing more, nothing less.