Gluten, or any food for that matter, does not necessarily get digested and metabolized before entering the blood stream. That is only what is supposed to happen. I have been shown partially digested fragments of food in my blood, under a microscope. That's from a leaky gut, with a lot of damage. People can have a leaky gut from other things, like a medication, I've been told. I've also been told, by a doctor addressing a local Gluten Intolerance Group meeting, that people don't fully digest wheat, barley, rye or oats, because some of the proteins are just too large and complex. It only takes a small fraction of a gluten molecule to cause a celiac reaction. There are multiple short chain peptides of gliadin, sequences of only 4 or 5 amino acids that can cause a reaction. There are multiple instances of each of these several peptides in one gliadin molecule. Partial digestion can make these peptides more available for our immune system to react to.
Joe, you have a lot to say, in many topics here. But you never cite a source for your assertions. How do we know you are not just making things up? As I understand the rules here, you can express an opinion (noted as such), or can cite a valid source to justify a proven fact. You do neither. Perhaps you are still under the influence of gluten. Who knows? I don't.