I have Crohns also, and basically have no effects from it besides occasional bloating and slightly-more-than-normal pooping 99% of the time. Strangely, the one massive event that occurred happened while traveling (ended up requiring surgery, which, which theoretically could have killed me). I also travelled in India for a few weeks (where Cotten died) and was fine with the food until a flare-up on the plane trip home (Delhi belly is a common thing among tourists).

It does sound suspicious, but the idea of someone dying of Crohn's in India doesn't sound as extremely unlikely as you make it sound. Also, medical care in India is well below the standards of what we might be accustomed to in first-world countries.

FWIW, I believe it's more likely that something else happened (poison/assassination, or faking his death, or suicide) based on the information I've seen, but I think a sudden, unexpected death due to complications from Crohn's is certainly a possibility as well