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I went to take a look at Honhima's and Gakkun's ark vods.
Apparently Yorumi was with Honhima around the time she first heard Luca and Shu screaming in the bog but they separated right after that so Honhima tried calling out to the ENs. When she was calling out to Luca and Shu, she also said konkon and nihao in addition to english
When Gaku first heard Shu, he thought Mysta might also be there because Gaku thought he saw Mysta. While he was looting Shu's corpse, Gaku's chat was just variations of 'senpai...' and 'so this is a senpai huh...'