It is not about downplaying law in any way. Law is extremely important (heck, i have luffy/law/kid as tattoo on my arm), buuuuuut... Law is the strategic one, the doctor. He is the support unit here. While Luffy and Kid are the offense. Right now, Luffy is way more offense than defense, and Kid way more defense than offense. Luffy needed to overcome his lack of defense (see him getting onehitted back then before udon), while Kid needs to overcome his lack of offense right now. And he will.