I don't, but it's mostly because Shiro probably isn't willing to go all out on Sapphire. When it comes to speed Shiro matches Sapphire, and he's not exactly lacking in the damage or durability department. If he could muster the imagination to do so, he could also twist his Illusion powers to be more effective than Sapphire's own disappearance based Semblance. But what he lacks right now is the will to harm Sapphire, which is why he's most likely going to lose. He needs to be more vicious.