They were literally soldiers created specifically to fight the old gods. Their entire empire and being wrapped around warfare and domination since that's what they were created for. They are also the only mortal race to successfully beat back the curse of flesh.
And I'm not sure what Chronicle might say on the matter but I get a strong feeling the reason the Zandalari were able to split the black empire was because of the Mogu.
Anyway, just glad to see them back and Ra-Den with them.