Never had problem with visibility, it glows like mad, cant miss it, big purple circle.
Usualy 2 waves coming, one from left to right, other from top to bottom, pick glaive as tank, position boss, wait till those waves cross, hit where they are crossed and vua la, u made room.
Even if u miss, if your healers arent afk making hole in one wall is enough.
Maybe blizz saw all those horde bias threads and wanted to give something to aliance? Idk, if it was on me ill gave them another horse, i heard they love horses