AI sovereigns start the game with two paths selected Warrior path and Assassin path (at least on challenging difficulty).

I assume it is to give additional edge to the AI sovereigns.

There are two problems with that.

First, the challenging difficulty is about best algorithms for the AI but no bonuses. this clearly is a bonus.

Secondary, the AI is so badly needing bonuses, that I am not againts giving them anything they can use (on hard and above) but this bonus actually harms them more then aid. This is becuase sovereigns get better by specializing not by leveling only. and three paths means they advance on three fronts meanign they never get good in any of them and just take some random traits from whatever come in.

This specially hurts the mage type AI sovereigns (Resoln, Pariden, Magnar) because they simply never reach high level magic schools and waste level advances on generalist traits. 

The easiest solution is to start the game with AI sovereign on level 3, 5, 7 respectively for the difficulties.

The best solution would be to allow prefered advance paths for the created sovereigns, so the AI knows what to specialize in. the choices would be: dodge, spell mastery, defence, attack, spell damage. additionaly the ai's should choose potential traits whenever possible if playing on large map.

This specializatin option should be available durign sovereign creation screen, so when played against one computer would know what was intended gameplay style. similarly all pregenerated champions should have this kind of preference set.