Kawaki's unconditional focus on protecting Naruto mirrors previous Naruto-Verse ... welcomed him into his home as if he were his own son. His feelings were further deepened when Naruto risked ...

The Black Rods, in particular, are highly potent and remarkably fast; Naruto and Sasuke were effectively defeated by this ability during their battle against Jigen. With Kawaki's limiters removed ...

Therefore, Kawaki will do anything to save Naruto, even if it means killing his only son. That said, there is a chance that Boruto might end up victorious and put an end to this feud.