Board Thread:Theories and Speculation/@comment-26636534-20150927142502/@comment-26537507-20150927203712

1. Probably because he was more concerned with winning the war.

2. He would easily be on route to becoming one of the most powerful characters in the series. When Sasuke and Itachi fought him, the only things they could use to beat him (that I know of) were Izanami and the Totsuka Blade.