Well.
What if Gaz's lost eye was light? doesn't seem too likely.
However, If he (along with Vathah) becomes a squire to Shallan, We'll find out, Won't we?
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Actually, I thought of something even better while I was typing this: If you were a One-eye, you could pretend to
be either a Lighteyes or a Darkeyes just by moving your Eyepatch. :-)
Are there any characters beside Gaz who wear an eyepatch/are missing an eye?