The Argussian reach are all the krokul on Argus. They have WQs and presence in all zones. Don't forget we get rep with them by recruiting the void-purged krokul troops in Mac'Aree. Also you seem to have glanced over my response without getting it. You spend a lot of time helping Alleria and the krokul against the void at the same time in Mac'Aree. It stands to reason that by the time you've finished the chain you've earned Alleria's trust along with theirs, and earning a leader's trust goes a long way towards earning the trust of their people. Remember how the entire Horde went from throwing rotten fruit at your death knight to accepting you, albeit grudgingly, because Thrall said so?