Oops on abandoning my own post
(family in town)! Thanks for the replies. I appreciate them no less!
Dannic--That's what I was thinking re: false neg on the barley...I am keeping my fingers crossed that his gut can heal with the true offenders out and we can get some other foods back.
an_aurora--Yeah, that's kind of what I was getting at. Like what the likelihood would be that it is gluten over a reaction to the particular grains.
kjbrown--he was not off barley, but I don't know that we ate it often at all. You helped me have a lightbulb moment on the eggs/corn. He tested fine for chicken, so the + for eggs is probably not because of corn, but because eggs are eggs. I was hoping it was corn, because I have been getting backyard chicken eggs from a lady here and she doesn't have to give them much feed. Ah, oh well.
We still haven't challenged anything yet. It seems like he is still getting to baseline. As in, he has slept in every day this week
(and is still sleeping as I type this) and didn't do that last week. Maybe next week we'll be there.
What would you all recommend starting with for challenging, or do you think it really matters?