I understand all the points and point taken.
If we think at bit and picture us my specimen without signature.
Then we read some books and facts about school, yasurimei, butt-cut, shape of nakago, hamon, yakidashi and so on. It matches and would be attributed to TAMEYASU. See kantei below.
I often hear "The sword identifies/confirms the MEI and not the other way around".
I can also see why it can be doubted when looking at the other characters like the TACHIBANA on the sword to the left. Completely different, but looking at what I regard as match, we see a match. I do, perhaps because I want to see a match. Anyway, I know it is legit and I will not give up without a fight.
"Shijo Kantei No 645 (October issue)
Answer and Discussion for Shijo Kantei To
645 ( in the October issue). The answer is a katana by Bitchu no kami Tachibana Yasuhiro
This sword has midare utsuri, and a gorgeous choji hamon, but the shape is as seen, and the shinogi ji has masame hada, and the boshi is komaru. From these characteristics, this is not an old Bizen katana, like Ichimonji, and it is more likely to be a Shinto period Ishido school katana. The modern Ishido school had branches in Edo, Kyoto, Osaka, Kishu, and Fukuoka, and each branch school had an original style and produced well made blades. Among these schools, a long yakidashi at the koshimoto is an important characteristic for the Kishu Ishido school. This hamon at the koshimoto shows a slight midare pattern which is different from usual pattern, but if this part were suguha, it would be a typical Kishu Ishido yakidashi. the Kishu Ishido school’s yakidashi yakihaba (width) are not an even suguha, and towards the upper part of the yakidashi section, the width becomes wider, and this katana shows this feature. Also, the Kishu Ishido school choji midare hamon have a wide hamon, as seen on this katana, and often the top of the hamon reaches the shinogisuji. At the same time, each choji is narrow, and entire hamon is smaller, and has a tight nioiguchi, and the hints mentioned these characteristics. The Kishu Ishido boshi are straight with a komaru, or are midarekomi, and often have a long return, like on this katana. They can often have frequent muneyaki. Among the Kishu Ishido smiths, Yasuhiro has more work left today. His nakago tips are iriyamagata, and on the ura under the habaki there is a mon, and from these characteristics, the Bitchu-no-kami Yasuhiro nameis suggested. Most of the people voted for Yasuhiro, and besides his name, a few people voted for Tosa Shogen Tameyasu and Mutsu-no-kami Tameyasu who are also Kishu Ishido school smiths. These smiths made choji midare hamon, and it is difficult to judge distinctively between their styles. In particular, Tosa Shogen Tameyasu has katana with mon on the omote side, so these names are treated as almost correct answers. Tosa Shogen Tameyasu has very few blades, and Mutsu-no-kami Tameyasu’s nakago jiri are kurijiri. Beside these, a few people voted for Unju Korekazu. As a Shinshinto smith, his mihaba are normal or slightly wide, and his kissaki are chu-kissaki or long chu-kissaki, which are common shapes. A choji midare hamon is his strong point, and a few blades have an Aoe-mon; so from these characteristics, people may have voted for him. Korekazu’s shapes are wide but his work show a thick kasane, and many of them have a narrow shinogi-haba which often are seen in Shinshinto blades; his jitetsu is a tight ko-itame and can become a become muji-hada type, and are often mixed with nagare hada. His early choji hamon, have narrow clusters, and tops are not round; there is a tight and strong nioiguchi, similar to Chounsai Tsunatoshi and Koyama Munetsugu. Usually his choji in each cluster are thick, the tops are large and round, and more likely to be similar to gunome midare hamon. There are dense nioi, dense nie, and frequent kinsuji and sunagashi. In addition, Korekazu has very few Aoi-mon blades, so please pay attention to these details.
Explanation and provided by Hinohara Dai."