He is 36 years old, he has had a lot of surgeries, he obvioulsy does not has the same level of motivation he had 10 years ago.
Do not expect him to be the "Old K-1/Pride Crocop" because he will never be again at that level.
Let's just be happy because we had the privilege of watching a fighter like him. He is a legend of the sport, at his prime he did a lot of awesome things.
Now I do not expect him anymore to be a beast and to destroy his opponent, I simply want to watch him fight and I just hope he does not end the battle seriously damaged.
It is like with Sakuraba. The guy is a legend, he has nothing else to prove. Of course he is not anymore at the level to compete with the Top fighters of today, but still it is cool to watch him in the ring.