I now know that a boss is not the same as a commander. If a boss dies, it does NOT cause his team to surrender. Got it. (Is this explained anywhere?)
I ALSO now know that bosses can grow in power, and his little picture changes as he does.http://s33.postimg.org/s75iojx0v/Grr.jpg
What I don't know is, how can I possibly know how strong he is? Is this explained anywhere?
On the single player 'Someone stole my oil' level, he grew at the end of Turn 12, then at the beginning of Turn 18, as you see in the image.
Killed all 205 of my attacking armies. :-(