Theory: Ninomiya's Pyramidals

The author has stated when shooter bullets are in different shapes than normal, it's because of drastic modifications to where Trion is allocated between the three primary stats. We see Ninomiya sometimes deploy cubes that split into pyramids, rather than more cubes.

Therefore, I believe this may be him taking away all the extra range his high Trion offers him to up firepower and speed even further. After all, in most situations he won't need that range. This makes him even more dangerous, as it essentially lets him divide up Trion between just two parameters after a certain point.