Hello Dave,
I agree with you, Paul and Pat all are Corn Buntings., the single bird (picture 1+2) and the flock in the last picture.
A Twite hiding among a flock of other birds looks like this (with a Tree Sparrow. Fiener Bruch near Paplitz, NE-Germany, 10.11. 2019)
Please compare the uniform caramell-hued and unmarked throat (like every pattern there is erased by a extensive rubbering), the stubby bill and the narrow, notched tail (not so extremer in Corn Bunting).
But you have surely noticed this in the field, which gave you the gut-feeling, that these are Corn Buntings. You might havent noticed consciously, but thats jizz identification.
I have written this before: Corn Bunting is one of those birds that you should stick with your initial, emotional jizz identification. If you see a bunting and think its a Corn Bunting, than its not a good idea to look at this bird longer and beginning to rethinking your identification.