“Cryptic distortion” is disruption of microscopic structures in the gut wall called crypts. It’s less significant than cryptic atrophy. It’s not definitive evidence of Crohn’s, and I don’t know whether it might show up in pouchitis. Was the cryptic distortion in the pouch itself?
I’ve never had nor needed a B12 shot. I do get my B12 tested occasionally, since we are at increased risk of B12 deficiency.