What is interesting about the SIBO-Crohn's connection is that now that SIBO is recognized, the diets that are used for crohn's like EN, are just as effective for SIBO.
Researchers used to come up with lots of ridiculous explanations as to why EN works for crohn's disease. Vitamins, low particle antigens, lactose intolerances, etc.
What EN actually does is simply bring down bacterial load in the intestine, this has been confirmed with multiple studies. It doesn't matter what type of EN it is, what vitamins it contains, it simply works due to the high bioavailability of the maltodextrin and proteins that have such high bioavailability that they get taken up high in the intestine, depriving bacteria of nutrients. This results in a rapid decrease in of bacterial load which means less bacterial antigen, a lowered immune response and a drop in inflammation.