You really have this backwards first of all frostmourne is being compared to Anduins sword and the dead scar that Arthas created is being compared to the burning the alliance made to get to undercity. Everything is pointing that Anduin will be Arthas and what a shocking twist it will be when they reveal Anduin and the Alliance are the real villians!
Laughing so hard right now because I read this exchange out loud to my husband who then said, "Should we send Sylvanas to resurrect Hemingway so he can write for Blizz?"