Okay, I'd like to make what is now Child.GMO Voltman's regular form, and what his normal form is I'd like to make into an Adult.GMO.
So his currently non-GMO'd form is now a GMO, and his Child.GMO is him.
Okay? I'll make some bogus reason like the GMO bonding with his data, but Shigeru managed to save his original form before the change and has tooled it into what used to be Child.GMO.
Also... Shigeru's 15. The old RP Shigeru was in a different dimension, by a convoluted plot device to get the Legacy items.