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Zalendra, why do you think the Sethrak are more likely to go with the Horde? i mean... the Alliance also does the quest where you save the "head" of the "Good" Sethrak.
The Horde spend a lot of time hunting down the Evil ones with the Vulpera, and the Vulpera really dislike the Sethrak (for good reason).
The Sethrak relation with the Zandalari empire was mostly lost after the Sethrak loa died, the only other Zandalari that worked with the Sethrak or still share their believes, are those that are exiled to Voldun, though if i remember correctly, we do see the head of the exiled in Zandalar after Talanji coronation, and with the revival of the Sethrak loa, we may see more trolls worshiping her, so that could make both groups rejoin. but if i'm not wrong, during Talanji coronation, we do not see the Sethrak anywhere
Note: When you make the Alliance outpost in Voldun, the commander mentions that they may look for allies in the locals, so that's a soft hint there for the Sethrak on the Alliance