we should consider the possibility that some people CoC haki produce white lightning maybe because of the bright attacks they have.
we know that Kid has CoC haki and got this chapter the following
obviously there is white lighting in Kid's attack
and here BM's black lightning and Kid's white lighting in the same panel
if that turns to be true that Sanji lightning as he used Ifrit Jambe might be as well CoC haki
an explanation for the white lightning could be that both Kid and Sanji both are using bright attacks. Sanj uses armament haki but it was never shown to be black when he used his fire attacks.
we know that Kid has CoC haki and got this chapter the following
obviously there is white lighting in Kid's attack
and here BM's black lightning and Kid's white lighting in the same panel
if that turns to be true that Sanji lightning as he used Ifrit Jambe might be as well CoC haki
an explanation for the white lightning could be that both Kid and Sanji both are using bright attacks. Sanj uses armament haki but it was never shown to be black when he used his fire attacks.