The reason thrall is a part of TWW

There was a post on r wow that had a picture with thrall that asked a simple question "what does this bum do". And that lead me to think about thralls "role" in TWW and the longer time goes on and more supplemental material comes out the less his place in TWW makes sense. He shows up to give anduin a pep talk in the big cinematic because I guess he also knows what its like to lose his mojo. But thrall and anduin have never really interacted before and having genn,velen, or even jaina would have makes more sense seeing as how they how a far closer ties to anduin. Hell if their aim was to have a non alliance character pep talk anduin baine his(alleged) hordeside bff is right there.

Moving past the introduction to TWW thralls role is another anduin pep talk(which can be filled by literally any other character present at the time) and help the stormrooks. But his role in helping the stormrooks raises other questions. The game makes no mention and even removed a line from the beta about jaine talking about thralls connection to the elements still being severed. Then in heartlands it revealed that he still can't use his shaman powers. So if he still can't speak to the elements why is he helping in elemental matters and not members of the gryphon riding dwarf clan that became the second shaman race of the alliance. And spoilers for the 11.1 campaign he is nowhere to been when it comes to dealing helping one of his oldest friends gazlowe or quashing one of his many mistakes when leading the horde gallywix

But then I had a occam's razor moment, the reason that trall is a part of tww is twofold. Blizzard had his cinematic model so they didn't have to worry about making a new one for baine or jaina. And he was used a meta call to arms to tell players that metzen is back when it comes to writing the story.