I really have my doubts that they would kill Aggra, Durak, and his potential daughter or second son offscreen. I personally think Thrall just didn't want to give that information out there to even his old friend Varok.
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I feel like they just didn't have them in it because of how limited their interactions would be in a short like that, especially when it isn't really about them. Spend all that time modeling and animating complex figures for little or no pay off besides being there. Idk.
That's definitely something you have to think about. At least with Thrall and the two Forsaken Assassins they probably had those 3D models from the BfA Cinematics prior. Thrall's was, I assume, a retextured and layered version of Saurfang's model with new assets applied.
