Danzo is a little weak
We all know Danzo almost injured sasuke fatally....
but the fact is he only knows grudge, stealing Sharingans and experiment of the shodai cells..
the fight with sasuke..eventually sasuke would have won in seconds.... but because of multiple uses of izanagi, it took hours...
using shisui's genjutsu, izanagi multiple uses, grudge towards hiruzen.... all he knows "equip" something to become stronger, not training...
so the conclusion is danzo is weak....maybe weaker than tsunade.....jk