While Soshitsu and Sotan were merchants under the patronage of Hideyoshi, Soku OGA was a merchant under the patronage of the Kuroda clan: the natures of the two types of merchants appear completely different through the history.
しかし、宗室と宗湛は秀吉取立て商人であり、大賀宗九は黒田氏取立て商人というわけで、歴史学というジャンルでは、両者の性格は全く違う。