Dr. Gonzales is a sixty-six-year-old male, and has had two heart attacks in the past five yeras. Obviously, Dr. Gonzales isn't in the greatest of health due to his old age, and possibly life threatening heart attacks. Therefore, at any point on the island Dr. Gonzales could die of a heart attack, and without the equipment present in a hospital - he would die.
Sadly, taking Dr. Gonzales wouldn't benefit anyone because he is too old to do much work, and with heart attacks in his medical history he wouldn't be able to do much physical activity. It is to be noted that he loves literature and quotes, and is a doctor in general practice, but his health overrides his beneficial qualities. Dr. Gonzales has positive attributes, but he will not be chosen to live on the island with six others.