Originally Posted by Before the Storm Chapter 3Sylvanas, despite admitting that her own sense of honor is not as strong as it could be, is so far the only Horde leader to have shown any respect for the Blood Oath. Her Warchief commanded, and she obeyed. Other Horde leaders only obey the Warchief's command as long as it suits them. As soon as they are asked to do something they have qualms with (like hurting the Alliance in Baine's case), they either resort to plotting and scheming behind the Warchief's back or committing open treason.Originally Posted by Before the Storm Chapter 30
In fact, Orgrim, Garrosh, and Cairne are the only other three Horde leaders who have done things the intended way and challenged the incumbent Warchief to Mak'gora instead of resorting to treachery. With all of them dead, Sylvanas remains the only Horde leader who respects the Blood Oath.