Board Thread:Boruto Discussions/@comment-1458758-20171229124917/@comment-33953813-20180101094901

Thekillman wrote:

First i though he referred to prosthetics, but now that i think about it... yea it can only mean that he was a medic, who started to specialize in puppetry for prosthetic applications, and eventually branched out to other fields via his mechanical engineering.

Considering that Konoha possesses the 6 bodies of Pain, it makes sense that Katasuke gleaned a lot of technology from them (as a medical ninja, he could do surgery himself and as a puppet expert, he could interpret the results much better).

I just hope Katasuke doesn't go on making inventions on the six paths of pain (eg. the recent ninjustsu absorbing suit). I just don't like the thought of ninja tech advancing to techniques which are exclusive to the Rinnegan, which itself is a godly power.