let's see.
zoro
black blades
adv coc dominated
adv armament
sanji
adv armament
adv observation
wake up coc
sanji and zoro have at least 2 or 3 latent powerups coming up, but luffy scales and grows at a different scale, the only way zoro and sanji close the gap is if in the next arc they take care of the final boss.
that the G5 render luffy unconscious/incapacitated for all or most of the arc, and rely on his most powerful fighters.
(reminds me of the scene in the hot springs of the movie Z, yes, I know it's not canon, but there sanji refers to Z having kairoseki and that cancels luffy's fruit, and sanji asks to fight with zoro to finish off Z .
if something like this happens, zoro and sanji approach luffy again, if not, luffy keeps fighting and increasing his powers, they will never reach/approach him