Third, what is the historical context?
Previous secretaries-general have seen Article 99 as a last resort: Lie used it 0x, Hammarskjöld 2x, Thant 1x, Waldheim 2x, PdC 1x, B-G 0x, Annan 0x, and Ban 0x.
Some have used it implicitly, including the current SG over Myanmar in 2017.