Al-Qadsiah is indeed a newcomer this season and of course, like Al-Ahli last season, they are also encouraging the recruitment of European players here. If we remember that Al-Ahli brought in several other European players such as Firmino, Mahrez, Saint Maximin, they did it because they knew how difficult the competition was in the Saudi pro league which was starting to be filled by several former European players.
Al Ahli already played in SPL for years, it is different with Al-Qadsiah which is just promoted into SPL. I also doubt that Al-Qadsiah can build their squad massively as Al Ahli because it must require a lot of money. Al-Qadsiah also won't be easy to attract top European players because they are not top teams in SPL. So, Nacho chooses Al-Qadsiah probably because of the salary or the status of a captain team.
Two team have quite big differences and we will never be able to equalize them, moreover Al-Qadsiah development will really be tested in the SPL competition next season, they will be under series of pressures against strong SPL team who always dominate.
Maybe Al-Qadsiah also has lot of money with the ease of bringing in some great European players, but that won't guarantee they can survive the really tight SPL competition, maybe they could also be relegated again.
We see how they prepare the team and start the season by entering the most important League in Saudi football, there are doubts for me about Al-Qadsiah being able to stay here for long.
Regarding Nacho, it is clear that money is his main goal, it is impossible for him to play with Saudi team just for low salary, but this is Saudi football which can always bring in lots of European players.