(For all intents of purposes, I think it’s the safest to say that the Paladin PC is an Alliance character. The lore of the artifacts, and with the fact that the entire organization is called the Silver Hand, which is the Alliance’s main Paladin Order, it just makes the most sense that the Paladin PC was a human or dwarf, most likely the former. To add to this argument, while not entirely impossible, it would be a little odd to have Liadrin, for example, taking orders from her subordinate, as she is the Matriarch of the Blood Knights. The same could be said for the Boros and the Hand of Argus, and Aponi and the Sunwalkers. And before the return of Turalyon, the Silver Hand had no such member remaining, as Tirion had just passed away.)
As Legion began, Highlord Tirion Fordring died and the Paladin PC was appointed as the next Highlord of the Argent Crusade. However, the Argent Crusade then merged into, or “reformed”, the Silver Hand, alongside the Blood Knights, Hand of Argus, and Sunwalkers, and so the Paladin PC was then appointed as the Highlord of the Silver Hand, instead.
As Legion ended and we moved onto BFA, the Blood Knights and Sunwalkers left the Silver Hand, as the Silver Hand was always an Alliance organization. I’m not sure if the Hand of Argus left the Silver Hand or not, nor am I sure if the Argent Crusade did.
While the Hand of Argus didn’t have any prior history with the Silver Hand, they are both Alliance Paladin Orders, so I see no reason that they would feel the need to distance themselves, especially with how intermingled Draenei and Humans have become, which is even further supported by the return of Turalyon, and his position amongst both races.
But with the Argent Crusade, it’s a different story. The Argent Crusade does have a long history with the Silver Hand. In fact, the Argent Crusade was originally founded through the union between the Argent Dawn and the Silver Hand. As far as the Argent Dawn goes, their membership was always limited, as the Argent Dawn was always a pretty small faction. The Silver Hand, on the other… hand… made up a much bigger chunk within the Argent Crusade. In fact, Tirion himself was a member of the Silver Hand, not the Argent Dawn.
When WotLK ended, Tirion, elected to keep the Argent Crusade neutral, similary to how the Argent Dawn was, and would have the organization focus their efforts on wiping out the Scourge in the Eastern and Western Plaguelands. This worked out fine, for the most part, and any members of the Silver Hand that wished to return to the Alliance were freely able to, as well as those that wished to remain with the Argent Crusade could do so as well.
However, with Tirion’s death, the Argent Crusade merging into the Silver Hand, and the Paladin PC being appointed as the Highlord of both organizations, we’re faced with a political crisis.
Since the Legion’s defeat, we have seen the Silver Hand actively supporting the Alliance. Turalyon was leading them in the Battle for Stromgarde, for example. With the Silver Hand actively supporting the Alliance, this turns the entire organization that remains hostile towards the Horde.
It’s also unclear if the Paladin PC is still the Highlord of the Silver Hand. As I’ve gone through my BFA quests, I have been referred to as “Highlord”, at least once. I’m not sure if it happened any other time prior, but just the other day I was referred to as “Highlord” by the 7th Legion Quartermaster, when I turned in my Bonus Rep Cache.
It is still possible that the Paladin PC relinquished the title of Highlord after the end of Legion, and the 7th Legion Quartermaster could have just been being honorific, but I haven’t seen really any definitive indication either way. If the Paladin PC did, however, I feel that Turalyon would ultimately be the Silver Hand’s next choice to become Highlord, but again, I’ve heard no mention of this.
Anyways, since the Paladin PC was also the Highlord of the Argent Crusade, when the organization merged into the Silver Hand, is it safe to say that the Argent Crusade is now actively a member of the Alliance? I see no reason that the Paladin PC would choose to pull the Argent Crusade out of the Silver Hand, especially given that it is most likely the Paladin PC was a member of the Silver Hand. And furthermore, the Paladin PC is currently not a neutral character like Tirion was, either. The PCs were pretty neutral in Legion, but we’ve been set as Alliance and Horde, respectively, in BFA.