Enlighten us, what does equate a conqueror?
its clearly spelled out for you in the manga: CoC is the power to intimidate or in certain translations the power to overwhelm and overpower the will of an opponent, where as the potency is measured by ones willpower.
Sanjis has not shown such qualities, not once not ever.
so no he lacks any equating qualities to unlcok CoC, family lineage doesnt mean much when not a single vinsmoke has ever shown such.
he parallels Scopper big whoop this is just recent info which once again is a plot convenience for Sanji, we've known since pre-ts Saboady that Rayleigh was Rogers undisputed RHM, Scopper has been mentioned but nothing mention he was the LHM once again just cause their is parallels does not insta equate to having CoC, just cause Ray had CoC we didnt just insta assume Zoro had it for that fact.
and the rumblings of sanji now gaining CoC is directly tied to plot convenience needing it to fight HK, and Scoppers explanation of such.