we could headcanon that these troops were donated by tyrande to the high king but she still take her main force to darkshore.
but i am going to be honest i am really confused of why they used these troops in the suicide mission. i mean yeah, it worked but those were very specific races, in particular void elves. i think that they just went extinct.
then we have some kaldorei and worgens present there as well.
i don’t know i am kinda hoping that something happens in the alliance that actually creates a good division in 8.2. but i will keep my expectations low.