Nobody

Piers, As you found, it looks like a takohiki. Takohiki (蛸引) type is mainly used in Kanto area and yanagiba (柳刃) type is used in Kansai area. Both types are used to cut sashimi.

志津 - Shizu 康永頃無銘 – Around Koei (1342-1345), unsigned 正宗十哲志津三郎 – Shizu Saburo of ten great disciples of Masamune 長サ壱尺貮寸九分 – Length: 1-shaku, 2-sun, 9-bu 昭和甲午年夏日 - Showa … (cannot decipher with confidence) 光遜 - Koson

There were many samurai dramas after the early 1900s. Most of them were entertainment works with questionable historical accuracy. As one of nonsense settings, samurai use their kozuka as trowing knives in films. Ordinally people still believe such acts even nowadays. She might be merely one of them. And I think that she confused kogai, kozuka/kogatana and kankyuto/bashin. Samurai TV drama in 1972, false use of a kozuka.

吉岡豊前 – Yoshioka Buzen 麒麟縁頭 – Kirin (Qilin) fuchigashira 赤銅魚子地 – Shakudo, nanakoji, 高彫 - Takabori 銘 吉岡豊前 – Mei Yoshioka Buzen 　　名作也 – Great work --- Seems to be added later. 昭和壬子秋 – Showa Mizunoe-Ne (1972), autumn 寒山誌 – Kanzan wrote.

The descriptions are the owner’s name and the date of issue. The format was used until March 2012.

FYI, comparison of swords without a hi and with a hi. Watch from 5:30. 日本刀に彫ってあるミゾ(樋)はどんな意味があるの？溝がある刀とない刀の違い（What does the groove on a Japanese sword mean?）

正宗二十代孫 – Masamune’s 20th generation descendant 相州住綱廣 – Soshu ju Tsunahiro Might be this smith? 日本刀 短刀　正宗二十代孫　相州住綱広 （十三代）｜日本刀 刀剣販売 e-sword

"藤四郎" usually reads Tōshirō.

The seller’s description seems to be correct. 脇指　無銘　（兼房） - Wakizashi, unsigned ((Thought to be) Kanefusa) （切付銘） - Kiritsukemei 寛永十九年三月ノ初五 – Kanei 19th year (=1642), the 5th day of the 3rd month 於武州江城□脇毛深守土中五寸 – At Edo in Bushu, cut through shoulders and into the mound by 5-sun (=15 cm). 石原小□彦成正（花押） - Ishihara ??? Narimasa/Shigemasa (+ kao) 長一尺二寸九分強 – Length: A little more than 1-shaku, 2-sun, 9-bu

信光 - Nobumitsu

I have not seen his works. So, I am not sure but maybe this man. Ref. Louie Mills (1944-2018) – Crossed Heart Forge

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守護短刀　壹振 – Gurdian tanto, one 日本砂鐵鋼業株式會社以精錬鋼長七寸謹作大坂住月山貞勝 – Using the steel refined by the Japan Iron Sand Steel Industry Co., length 7-sun, respectfully made, Gassan Sadakatsu in Osaka. The note on the paper seems to be poems. I think that they are not directly related to the tanto.

Ref.

Though it may not be necessary to say, a genuine torokusho does not proof that the mei on the sword is genuine.