If I can just continue the African Union Peace and Security Council approved a peacekeeping force to Burundi, and indeed they had to abandon the plan in January 2016 in face of the strong opposition from the president, who said that any such move would be considered an invasion.
You asked specifically whether the number of human rights observers and military experts is enough. What's important is to get eyes on the ground and to have people bear witness and stand with the people of Burundi.