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I found seven unnamed Le-Matorans in MNOG.
First two on the image were gukko pilots so those were probably either Shu, Taiki or Boreas.
Orkahm was also mentioned under name Orkan in MNOG II as gukko pilot so he might be one of those matorans too.
Only Ahkmou from metru matoran had kept his old kanohi so orkahm could use different one on mata nui.