Did you notice this from your link?
Apparently all-caps isn't just Celtic, it's a time period. I wonder if that matters? Again, because they always use all-caps in Buffy 8 it would be hard to attach significance. I wonder though, if maybe that's why they didn't capitalize the a. Do attract our attention to it, and give us something else to drive us crazy trying to figure out. 🙂
No I didn't see that, I was just browsing quickly, didn't really have time to explore...see I don't know if the A is caps or not. It looks like its in lower case but it also looks like it could be in caps depending on the font and since we can't seem to find the font it's kinda up in the air, but in that font A linked to, the A in the comic is a capital.
To be honest I think it's a mixture of a couple different fonts, it seems it is all fairly traditionally celtic except for the u and m and of course the letters that ddon't exist in the Irish and I would presume Scottish alphabet since the languages are basically the same. But I agree, it's definitely something else to drive us crazy!