Ryotaku did not put his name in Kaitai Shinsho as a translator and editor because he recognized that the translation quality was quite low (however, the translation quality was exceptionally high considering the language level in Japan of that time).
良沢が解体新書に自らの名を出さなかったのは、その翻訳の不備（とはいえ、当時の日本の語学水準からすれば、その翻訳は奇跡に近い完成度を誇っていた）を自らがよく解っております。