I was putting some figures back into storage which hadn't sold on eBay yesterday and as I was transforming Armordillo, I couldn't help but notice the strange ridge on the top of his robot head. That reminds me of someone else in the TF universe. Ironhide. And the similarities don't stop there.
Ironhide was meant to be a great warrior, well for a basic sized figure, Armordillo comes with 2 weapons, some basics didn't have any.
The name Ironhide would have been quite apt for a Armadillo, with a thick shell.
So I can't help but think that in the very early design stage, Armordillo was perhaps going to be named Ironhide. Perhaps it was withdrawn because of the use of the Ironhide name in the Magnaboss combiner team or maybe they wanted to make more new characters instead of rehashing old ones.
We'll never know but it was just an observation.