Oh, I wasn't saying that they were as big as humans, just that they were bigger than most of the animal Muppets. And I wasn't saying that the group shot showed their height, just their relative proportions -- in most other shots they are clearly not even on the same plane, being way in the back. They are still 2 or so inches shorter than our 7-inch action figures, which represent 6-foot human scale.
This shot (not a composite, I don't think), puts Waldorf on a plane with Kermit, and his head is pretty big
But glad you like them otherwise. I still like your display! I need to clear a space to do that myself.