Drapanai have a morale of 15. With so many men on the battlefield, it is unlikely that they will rout before having their unit size reduced to ~20 or less (normal unit sizes).

If this was a human vs. human match-up, I would predict that the Toxotai would win. It would be too easy to pull back all of the archers and set them up so as to form a crossfire, especially if the Toxotai have the height advantage.

In a human vs. AI battle however, the Drapanai can easily win.