Let's see probably because Yul the honest Worm described himself as having wings and jaws and being coiled - that's pretty dragon like. Also, they speak with the same "Oh {insert noun} mine..." That's pretty damn specific to the Ahamkara. Also they are known for granting power and knowledge with dark consequences also as a side tidbit it makes sense that all the Hive would be named things like Knights and Wizards and other Medieval sounding names of they worshipped the dragons. The worms that the Hive ingested were just the larvae, the baby dragons, so they don't look like the big grown adult dragons but they do grant powers to the hive for feeding them. The Ahamkara are not extinct and seem to be immortal just like how they grant immortality to their host. How can you read the grimoire and not see how the Worms are Ahamkara? Lol @ "little to nothing to back it up"