I know I should have made a screenie but I forgot...
On the bottom right, where the portraits of your currently active army are shown the portraits sometimes get mixed up. What do I mean by that? I had an army of 4 champions, and some regular normal units (3 different types), but somehow 50% of the portraits where the one of Janusk and the other 50% where the ones of the advanced scout. It appeared the Janusk picture was preferably given to heroes/Champions but it could be a coincedence.