@Ominous I think Kaji figured the polygraph trick out last chapter possibly, and is being annoying just to get a reaction from Yokoi, since last chapter the Captain missed after Yokoi and him started screaming for him to miss. At that point Kaji made a face like he understood something, and this chapter he's back to being annoying, getting a reaction out of Yokoi, and right after that the Captain missed, so I think he's onto it. I think the theory is pretty much 100% confirmed at this point as well. Really curious to see what will happen now that Hachina has no way to communicate with Gakuto (or does he?).
@belkrax
It's quite reminiscent of Kaji yelling at Kyara to get lost during the Hell Bull arc. Feels like a stupid move given the situation. It might not be if the phone doesn't matter for Hachina to contact Gakuto, and so this is basically a mindgame to mess with Lucy, but I'd imagine there are better ways to get to this point.