Well, from reading the above...it might be yet another gluten-free mistake I've made in that I tried oats DURING those first six months...and my gut was on a really wild roller coaster anyway back then. I haven't tried oats for the past 8 or 9 months at all. I got scared away from them back the other times I tried putting them back.
Also, I'm quite sure I don't have easy access to guaranteed, uncontaminated oats...
Since I'm feeling pretty good these days, and oats aren't really the thing I miss much, I probably just won't try anymore, myself. Also, Dr. Kenneth Fine seems to always just include oats on his gluten free list, so he must have some reason to suspect they are likely to cause trouble in enough people to just leave them out.
What I miss most is wheat and spelt. I never think about oats...I do think about breads, rolls, pastries, etc. But I know better than to even think about that too much.\
I did buy a package of some Bob's Red Mill bread mix last night and made some of that...I used flax meal soaked in hot water for the eggs, and we really thought the stuff was pretty good. Easy to make too!
I made it into a loaf of spinach bread...layering it with chopped, sauted spinach and onions...I used to do this with regular homemade breads. I would roll up the final rising loaf with spinach/onion mixture spread onto it before rolling. This stuff I just layered with spinach/onion as I packed it into the bread pan...but as I worked with the top layer, I discovered i probably could have rolled it up if I would've been extremely careful and kept my hands wet while working with it...so...I'll buy more and try it that way next time.
I also plan to get another package of this stuff and make it into cinnamon rolls and/or nutty sticky rolls...now, that's the stuff I really miss...not oatmeal...
Anyway, back to topic, here...I think if I were gonna test the oats, knowing what I know now, I probably would wait until I felt stable gluten free...until I felt pretty much healed, settled down, just stable and good and gluten free. Then I might attempt to add them back one day, and then watch closely for the next 2 or 3 weeks to see if any weirdness develops. I'd do that a couple of times, assuming I saw nothing odd happen, and then just gradually add them back, a little at a time, watching carefully for any sign of symptoms returning.
As I've said before, there can be a problem noticing the return of symptoms. After I kind of tried gluten free, making mistakes all over the place, back in 2001, decided it was no good and then went back, symptoms crept up so insidiously that I didn't quite put it together for another few years. Just adding insult to injury...MORE damage to heal...so, that's why I would be very cautious about attempting to add back the oats and being able to hang on to enough perspicacity to catch any sneaky symptoms.