Is it Kendez's reason to get rid of Walton?

Because his son Kenba was injured, Walton defended the man who injured his son, which made Kendez decide to start with Walton?

Because of their long-standing disagreement, Kendez wants to monopolize the whole of Santania?

But none of these seems to be the main reason. From the amount of money in Kendez's private accounts, it seems that we can analyze how much Kendez loves money.

Kendez is over fifty years old. According to the records, he really has his present status in less than twenty years. Even before that, he was powerful enough to accumulate some wealth.

But there is no...