Hi Blitz! I just want to say welcome! I'm kinda with Rider in that I don't think we'll see a cure any time soon. Far too much time and money goes to drug research for treating symptoms, not to determining the cause.
So you asked what we think. Our GI does not believe CD falls into the usual parameters of a true auto-immune disease. When he was really pinned down he told us he believes there is an environmental trigger--that it's likely infectious (he wouldn't commit to what he thought the pathogen might be). I'm going with that because that's the explanation I like.
lol! He also mentioned a "massive imbalance of gut flora".
So since I don't believe it's a true auto-immune disease, the Marshall Protocol does not apply and I have my son take D3. We have also had great success with the SCD. Since the purpose of the SCD is to improve gut flora, it seems logical. This is jmho, of course!!! ...Just what I think....