Senju Shinobi dies during the third Shinobi war and gets reincarnated as itama senju in the warring clans era with the skills Copy and devour. Also since it's his own skills he can't be controlled by the skills 
Copy: A copying ability that allows user to copy whole living or dead bodies and inorganic objects. The copied objects or copied people also completely copies all the abilities of the objects or people that was copied including chakra 
Devour: A ability that allows user to create a small black hole from there hand and just needs a small amount to absorb anything to gain its abilities, skills, techniques, appearance and chakra

With Tobirama as a willing accomplice, Itama's hidden work accelerated. Using copies of master builders and craftsmen, he produced detailed, practical architectural plans. Using **Devour** on clay and stone samples from the future Konoha valley, he understood the land's composition and stability.


He and Tobirama, under the guise of "theoretical exercises," presented Hashirama with plans for defensive walls that incorporated natural ley lines, aquifer maps for clean water, and grid layouts that allowed for both community and defensive segmentation. Hashirama, overjoyed at his brothers' shared passion for his dream, embraced the ideas. The dream was slowly being given bones and sinew.


Chapter 23 - The Architecture of a Village