@V_O_I_D in the previous chapter they said he cannot get to six rank without completing the system mission and about the beast IF MY understanding is correct they were kil*ed by their leader's move so he doesn't get their EXP hope this clarifies your misunderstandings
ℑ'𝔳𝔢 𝔩𝔬𝔰𝔱 𝔠𝔬𝔲𝔫𝔱 𝔬𝔣 𝔥𝔬𝔴 𝔪𝔲𝔠𝔥 ℑ'𝔳𝔢 𝔯𝔢𝔞d
ℑ 𝔴𝔬𝔲𝔩𝔡 𝔥𝔞𝔳𝔢 𝔟𝔲𝔦𝔩𝔱 𝔞 𝔩𝔦𝔟𝔯𝔞𝔯𝔶 𝓲𝓷 𝓶𝔂 𝓹𝓪𝓼𝓽 𝓛𝓲𝓯𝓮 𝔦𝔣 𝓽𝓱𝓮𝔂 𝔀𝓮𝓻𝓮 𝓫𝓸𝓸𝓴𝓼 𝔱𝔥𝔲𝔰 𝔪𝔶 𝔫𝔞𝔪𝔢