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.