My theory how Dr. Klein was healed is that he basically starved out his infection of Colitis with vegetable juices. All of the testimonies I read on his site or others doing raw vegan diets are basically to the affect of "Yeah I'm doing much better on this diet!"
If you look at recent pictures of him, no offense but he is a twig. He actually says in his book that you shouldn't eat more than a quarter of an avocado a day. Screw that. I'm not going to starve my entire life in order to only maintain symptoms.
Some of us have jobs and enjoy sports.
If you don't consume quality animal protein you will never heal unless you supplement with quality amino acids.
If you want to cure Crohn's figure out a way to kill Mycoplasma/Mycobacteria which causes it. There are probably many ways but in my experience using Colloidal Silver and the Beck Protocol is superior and I am almost symptom free except for residual damage that needs time to heal.