Can't explain the pic of Huff muscled up in '20. I've seen him look straight skinny in photos since. Sometimes guys that are all muscle/extremely-low fat look that way in t-shirts. Too, after months of practicing in extreme heat there's probably weight loss, possibly significant for some.
At any rate, with some guys it just takes time to physically mature, AND credit the new program as well. Guys can't just quietly come around after 2-3 years in the program with the microscope the highly touted one's are under in the day we live. Hopefully we get a handful of surprises from guys we've written off too soon.