Al Nassr signed Felix to help Cristiano score the goals which they need if they want to become SPL champions. If their defence will be connected they will not let goals get past their goalkeeper. Al Nassr have a team which can win the SPL but Al Hilal, Al Ittihad and Al Ahli are serious about winning the SPL for their owners and fans.
A team without superstars can succeed and win trophies if they have young dedicated players who are willing to represent the team and give their all to ensure they win matches and win trophies but the case of the teams in the Saudi Pro league is different for example Al Littihad that was good last season of you look at the players in the team you will discover that they have young players who have decided to give their best to ensure they win matches for the team.
Al Nassr has superstars like Ronaldo and the rest of the stars last season but coming to this season they have signed more quality players you can't compare their past performance to their present performance the difference is very clear.