Azeroth had many allies. Dalaran and Quel'Thalas, for instance, were allies, and the human nations were also allied with one another.
As for models of the best possible allies, consider Quel'Thalas and Arathor, or Quel'Thalas and Dalaran. When the High Elves sailed east, they encountered an army of Forest Trolls. The Sunwell had not yet been established, Quel'Thalas's ultimate defenses had yet to take shape, and with the protection of the Well of Eternity gone, afflictions such as disease and aging began to appear among the High Elves.
In the end, left with no other choice, Dath'Remar and the other elves secured the Kingdom of Arathor's support in exchange for teaching humans magic. Afterward, the High Elves honored their promise and taught humans how to use magic.
Later, the Kingdom of Arathor split into seven nations, while the High Elves' rulers were largely still of that same generation. Apart from Patrick, the Council's leadership and the king had little interest in the seven kings.
As leaders of their respective nations, helping one another when another nation ran into trouble was a moral duty, while standing aside was understandable. But if you kicked someone while they were down, you could hardly blame them for taking revenge once they got out of trouble.
The Kingdom of Gilneas was notorious for staying out of world affairs. Relying on the Greymane Wall and Biting Reef, Genn Greymane felt that other nations could not interfere there and began closing his kingdom off from the outside world.
Seeing no hope of a detailed discussion, Darius could only seek out Tirion and sound him out indirectly. Tirion was very interested in bringing Gilneas into the fold, but his view was the same as Patrick's: this needed to be discussed with Genn. After all, the king of the