GULLIT - SBC - not good !

my MIDFIELD rate was 89 when gullit on the bench 

when i but him on my starting squad , my MID rate going to 82 !! 

And the Playstyle Relentless not working !! 
i try to avoids playing with him in the game to save the stamina , nothing change same stamina for the other players dont have the playstyle 

can anyone explain that ?