Thoughts on the scenario after completing "Hammers of Fate".

Railag conquered his clan, although before that, "Grim Hearts" was considered the strongest clan.

I didn't know... But I read somewhere that "Grim Hearts" were always allies of the demons, so the question arises: why didn't the demons help Thrall in the final battle with Railag? After all, Railag was the number one enemy of the Overlord. They could have helped their allies in case of success and pleased their "master," but why didn't they do it?