Auric has not been very present in the lore since WOTLK.
The return of Alleria could strengthen his attachment to the alliance, I do not see him betraying a hero of Quel'Thalas whom he represented during his absence...to join the horde.![]()

Nah it isn't. Rhlor is being sincere, I just think like @MyWholeLifeIsThunder said - he may not realize the implications of what he's asking for.
I think sometimes people don't realize how it comes off from what they're saying.
There is no point for Auric to change his allegiance and his entire point is that every High Elf and Blood Elf should be 'a whole' once more as they're all "children of Silvermoon".
But, as we'll see with Shadowlands, there's going to be High Elves fighting for the Alliance and High Elves fighting for the Horde. This shows that not every High Elf came back to join up with Blood Elves therefore the "children of Silvermoon" aren't united fully at all, which is Auric's goal/dream.
Also wanna point out, aside from Alleria and Vereesa, even Umbric himself has stated that "Alliance are where our people belong" so there's definitely a pattern of a portion of the high elf race feeling that Alliance is where they all should be.
- - - Updated - - -
As we've seen with some of the new leaders, changing factions isn't taken lightly. Calia didn't go Horde, Baine didn't go Alliance.
Auric isn't simply going to go Horde just because some High Elves decide to return to Silvermoon/Blood Elves.
But I also wanted to avenge the destruction of the Sunwell! and I suppose that wanting to protect the sunwell is a reason to join the blood elves when alleria almost destroyed it. but I repeat I think he is the character that can best be a representative of the high elves of quelthalas!
If I were trolling I would name characters with a greater connection to the alliance and I do not think that someone like Jalinde Summerdrake or ranger lord hawkspear should fulfill that role, much less others like Vereesa who should be one of the leaders of the Thalassianos of the alliance with alleria and umbric!
I think of auric because I saw him fulfill the role of representative and he wanted the children of silvermoon to be united, instead people like hawkspear deeply hate the horde!and never imagine seeing him on silvermoon fulfilling that role!
- - - Updated - - -
I thought you were saying who could be the character representing the high elves in the alliance!
- - - Updated - - -
mop was 4 years before legion