its late in the series yet too early to conclude this matter
there is already a plot point Oda created where even Queen was astonished over what sanji was doing and not so much with the germa sibs.. and asked if sanji's leg is a machine
other detail that people misinterpreted and generalized is " germa elemental (lasers, lightnings, poison,wrench) abilities were also genetic" when in actuality Queen reiterated that judge altered his Children to have strength, steel skin, and mobility
Nothing of the sort about elemental abilities was mentioned, matter the fact... the only time Queen mentions sanji's fire abilities he assumes that its a mechanic leg analogizing it to his siblings which is interesting... that means he assumed sanji's fire comes from a machine part.. like Ichiji's laser does, Yonji's wrench does, Niji's lighting and possibly Reiju's poison unless he has a DF