1943? I assume that is a typo.
The Peace Faction was appointed in January 1944. The reason being, Japan was now half a year past the June-July 1943 point which an earlier study had indicated was the maximum time frame that Japan could wage war successfully before American industrial capacity was sufficient to turn the tide against Japan. Admiral Yamamoto was against starting a war with the US because he knew that once America ramped up her industrial might then Japan could never hope to match her production level. By January 1944 Japan could feel the ring of allied might starting to tighten the noose. So both those dates in the original post are correct.
Thank you both for your responses - makes sense.