I’m gonna say something wild but please consider this
This DF has evaded the government for 800 years. That means it must have done it EVEN IN DF FORM when no one had eaten it… How the fuck did it do that?
What if it somehow still has its reality warping powers EVEN IN DF FORM… Shanks somehow managed to steal the exact DF needed to be brought to Luffy… What if this was all the mind of the DF doing some kinda reality warping shit to make this happen