One down, three more to go. Who's up next?

Welcome to Warhammer Quest: Dark Water.
In this beer-and-pretzel adventure you control a handful of iconic heroes that wander the realm of Ghyran. This will be, for many casual players, their first taste the world of Age of Sigmar. Let's meet the poster boys.
...In particular, the guy in the helmet is the heavily armored tank that will be at the forefront in this introductory Age of Sigmar adventure, his name is Edmark Valoran, The Manticore Knight.

Now here's the question:

why is he not a Stormcast?
Is something changing at GW?

>>96751373
>Inara Sion, The Cleansing Blade
>Bren Tylis, The Renegade Saint
>Edmark Valoran, The Manticore Knight
>Drolf Ironhead, The Grizzled Explorer