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I don't know about the others, but Ikir's head can fit over Tahu's just fine even with the 2015 eyestalk.
If anything it's better, because Ikir's neck is stopped just at the right distance for his head to prefectly fit as a helmet, without requiring any more adjusting.
Turning Tahu's head becomes slightly more difficult, but it's a minor issue that didn't really require a new mold to be made.