Mechanical Monsters at the Fall of Gondolin?

[Maédhros]

I found it also necessary at firts to comunicat what we decied. But we did clearly disagree with Aiwendil in this. And in view of the principals, I must say, that Aiwendil is right: If we find that mechanical monsters are possible, than we must not change the text only for clearty.

Ok, but before your suggestion Findegil, we transformed the mechanical monsters into animal ones. If he had previously used type 2 for normal dragons, why can't that stay. We know that Glaurung existed, I think that it would be clear that Morgoth would have breeded more than one animal dragon if you will, leaving the type 1 and 3 as mechanical monsters.
The transformation of type 2 to animal dragons was an idea that came from jallanite, and that we all had agreed, you included Findegil.