Board Thread:Boruto: Naruto the Movie/@comment-26508646-20150902025453/@comment-4646462-20150905182239

I've said it before in a similar thread, but I just don't think the logic behind all these chakra modes' appearance has been thought through. AFAIK The Last's KCM was conceptualized before SPSM was, and Gaiden's chakra mode had no magatama. Hell, the back design on the original Bijuu Mode changed in between chapters. Also, the source of the mode is inconsistent as well. First, it was implied that it was Kurama's hatred-free chakra, then Minato attained it merely as a result of Kurama cooperating with him. Then Asura was shown to have similar chakra, and then that increased the confusion even more.

The way I see it, the forms have been changing mainly due to trying to find a balance between what looks awesome and what's easier to draw/animate.