Exactly. That’s why I’m rooting for a thorough analysis. The parietal eye itself is a remnant of a paired structure, so getting a single (in this case: third) eye from a pair isn’t unprecedented. 
Also, it’s development is separate from the ‘regular’, phylogenetically more recent eyes. However, both are extrusions of the brain, which makes me wonder what happend here. Could be some developmental genes got expressed in cells where they are usually dormant, or the whole structure got duplicated by a mitosis gone wrong. Either way, growing to 40cm is is quite an accomplishment for that particular danger noodle, and it might contribute to our understanding of developmental processes, so: double win!
