Sosgate's words were quite clear. His implication was that he had willingly acted as a lackey and never slacked off. If there was a problem, it had to have started when Ren Zhong went to the Shattered Star Ring. Once Ren Zhong's fleet returned safely, things were out of his control.
By this time, Sosgate knew that he wouldn't live for much longer. Anyway, all is at rest after death. A dying person is emboldened, and Sosgate had enough of Liu Jin, merely a lifetime viscount, constantly using the favor of Nanxiang Marquis Liu An to boss him around, a dignified hereditary viscount.
He rarely erupted, and even if his outburst seemed suppressed, it was already at the brink of his courage.
