Didn't

It was no surprise that many took the initiative to submit themselves to him. Dyon decided to focus his attention on them and ignore those who remained stubborn. It wasn't that Dyon didn't want to conquer it all, but rather that it wasn't as convenient. 

Sprite Alliance Territory was entirely controlled by the sprites. Even the most backwater places had their influence. So, by taking down their upper echelon, Dyon easily swept through them just like that. 

However, the tower quadrants were different. Often times, Clans would only control 50 to 60% of their quadrants, the rest of which would either be abandoned or controlled by beasts. This made it much more difficult to handle with ease. 

This wasn't the only problem either. One had to remember that many of the Outer Powers had pieces and pawns within the Tower Quadrants.