Board Thread:Naruto Discussions/@comment-46214474-20200629021640/@comment-6769189-20200629113849

You are still assuming that Madara never used any of those abilities or practiced with them to any degree. Clearly he did because Tengai Shinsei isnt some noob technique used only with prior knowledge.

Madara himself also had a ton of battle experience. He was a child soldier and spent most of his life fighting in war. Adjusting to the use of 6 new abilities wouldnt be difficult for him. Even Sasuke after what seemed like only a couple hours of observation was using Rinnegan abilities easily.