That makes a lot of sense.
I just got diagnosed 3 months ago but a lot of stuff makes sense now. When I was a kid (50 years ago) the Dr though that I had a problem with my stomach and my pylorus since my stomach would not empty sometimes and got badly swollen, you can imagine, they though I had pyloric stenosis and problems with intestinal mobility and they tried that with metrochlopramide and antiacids with little success....later it was chronic duodenitis?....
Later suddenly in my thirties all that that suddenly stopped!!!....I was so happy!!!.....but then after a while I got the more classical diarrhea bouts with mucus and blood....after several colonoscopies and biopsies they though that it looked like Crohn's but also like UC and proctitis etc etc but since the biopsies came back negative they never gave me a diagnosis but anyway threated it with Asacol and Pentasa etc etc but they did nothing for me, the only thing that helped me were short courses of Prednisone but they did not want to prescribe it since I was only supposed to have IBS.???
Fast forward several years and I finally got peritonitis and they took away my sigmoid colon after it burst ....after the anastomosis I never ever had any more diarrhea bouts again, so happy again!!!.... until I had several blockages caused by "adhesions"....
Well to make the story short 3 months ago I went to see another GI and this one did another colonoscopy and my colon was beautiful but he continued into the terminal ileum about 20 cm and it was a disaster full of Crohn's lesions until he could not continue any more since I had a stricture that he could not traverse.
After I wake up he goes.....hey dude you have really bad Crohn's disease and a really very narrow stricture, why you did not treat that before??....LOL.....well it was a shock....so I suspect that Crohn's travelled from my stomach and duodenum to my sigmoid colon and then to my terminal ileum now....but in my case it seems that it disappears from one site to just appear in another.
I suspect now that it was Crohn's all the time.