After that, while his younger brother was appointed as Junii Gon Dainagon (Junior Second Rank, Provisional Chief Councilor of State), it was in 1240 that Kinmoto was able to become Junii, and it was in 1241 that Kinmoto was able to become Gon Dainagon.
その後、弟は延応元年（1239年）に従二位・権大納言となっているのに対して公基が従二位になれたのは仁治元年（1240年）、権大納言となれたのは仁和2年（1241年）である。