Zoro and Sanji will become stronger than everyone except Luffy eventually, maybe by the time this arc ends. But so far, that's not the case.
Sanji had so far been nerfed post timeskip. Only now Oda has started giving him some serious powerups. And Zoro has only fought fodders post timeskip (yeah, Monet and Pika are fodders in the bigger scheme of things). Despite all the fan boys hyping him up, he got wrecked on rooftop and is only alive because of plot armor and senzu bean.
Kid has taken several high power attacks from both Kaido and Big Mom, been beaten up but never needed a senzu bean.
Law's devil fruit is broken and for Zoro to go above him, he will have to develop his conqueror's even more. He has only just realised he even may have conqueror's, forget about learning to properly use it. Though he will learn it pretty fast now, because of the plot. But it hasnt happened so far.
Anyone who disagrees, here have a senzu bean 🌰 that looks like shit because i cant find the right emoji.