Beautiful pot.
I can not read Japanese or Chinese, but I did take 2 semesters of Chinese. Learned enough to know I will never, ever be able to even do baby talk in Chinese. But I did learn to recognize a few parts of characters. LOL your photo of the signature is upside down. LOL. No clue what it says, but I got that much.
I for one am of the opinion that glazed or unglazed is very pot and tree pairing specific. I like some glazed pots with azalea, I like many unglazed pots with azalea. I had a mugo pine in a Randy Davis salt glazed pot, quite colorful, for a couple years. Rule number one, there are no rules. Rule number 2, if confused, see rule number one. Rule number 3, the Japanese aesthetic is a fully developed artistic system, if the Japanese ''rules'' of display tell you something, there is a fairly good chance that it will be at least attractive, if not the ''perfect'' thing to do, it will be ''good enough''. Good to fall back on if you don't know what direction to go.