Yes. An interesting find, and I'm sorry you are buried in yet another fruitless* discussion about sizes.
The legacy item description could be taken to describe a power that develops within oneself with the item as a focal point. So I wouldn't think it too much of a stretch to get to 'glowing eyes mean an internal power unlike cleric, wizard or sorcerer spells or psionic abilities or abilities embedded directly within an item'. Not sure if there is an index of 'glowing eye' occurrences; I can't dig deeper until after work. But I like this line of thinking.
* "fruitless" because no one seems to be changing anyone else's mind, the size limit for the FBS was just voted on, and the FBS doesn't really matter in the end. If I get bored tonight I'm going to work on a replacement suggestion I just thought of...