A trivial example. A player sits down to play in Warlords, creates a swamp map, and who will they choose as their companion? 80% will choose Tiaz, and the remaining 20% will be divided between Bron and Vistan, and others. But it won't occur to any of these players to choose Bron as their companion. To understand that this is the ideal companion, you need to read up to page 23 (exaggerating), where it is written that the unit specialist gives +25% HP, and read up to page 34, where it is written that scouting is not a useless skill, but allows you to split up from your starting location...

Where does this number of Warlords players come from? There are only a little over a hundred active players.