During my time with palliative care in Melbourne we often came across people who had come from Gawler's center. My only criticism would be (an this is a generalization) is that people are overly optimistic, so much so that they often in denial that there body is shutting down and even day or hours away from death.
But on the positive side, there are many. The most important is that he gives people hope. He does so through some basic holistic ideas; eating differently, centering the mind, your environment. Stuff that all people should look at and think about. Not just those with Cancer.
The idea that Gawler did or didn't have secondaries is a furfy. It dosn't matter; giving people hope is one of the greatest gifts you can give anyone.
If you want a pin up for someone who beat cancer, read Lance Armstrongs book; amazing.