Denis has been experiencing quite an unlucky run of health problems. Yes, he has potential, however it is important that he maintain his health.
People like Dennis tend to take their health for granted. They think they are invincible until they are met with an unfortunate and untimely health-scare.
Many bodybuilders who shoot the roids feel bullet proof. Steroids create an artificial window of invincibility. I just hope Dennis is smart enough to realise that his gross physical state is a result of using chemicals.
Anyway, good luck to this guy.