Ruby, I've written quite a few forum posts and blogs about Greek influences in the gallows chars. I think the lowercase are mainly influenced by Latin, but there was a considerable overlap between Greek and Latin scribal conventions (e.g., the way abbreviations and ligatures are designed) and it's my feeling that there is more Greek influence in the gallows that there is Latin. But the majority of the glyphs follow Latin conventions.
The problem with the Glagolitic alphabet that you linked is that there is only a very small degree of overlap. With Latin, there are many characters that overlap, and with the gallows, there are Greek scribal concepts that overlap. Glagolitic is only a small overlap and probably coincidental (and probably partly because some of the Glagolitic shapes come from Greek).
The problem with the Glagolitic alphabet that you linked is that there is only a very small degree of overlap. With Latin, there are many characters that overlap, and with the gallows, there are Greek scribal concepts that overlap. Glagolitic is only a small overlap and probably coincidental (and probably partly because some of the Glagolitic shapes come from Greek).

