Kuruharan: Greetings, thou invincible Dwarf!
1. Since the Rohirrim were not yet in end-of-Third-Age Rohan, they would have been natural enemies of orcs, wargs, and the Necromancer in Rhovanion. That does not necessitate an alliance with Dwarves or Elves. Such an alliance would have to have been forged by means of leadership from Gondor, with the Elves and Dwarves agreeable. Such agreeability would require either a charismatic King in Gondor or a grave need, and maybe both. The Witch King of Angmar could be construed as serving as the need, but we no so little about the character of the line between Arvedui and Aragorn. Clearly, that line was volatile enough to provide as vigorous a descendant as Aragorn yet weak as Arvedui. At least in terms of character. So there's much leeway there.
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