He could have avoided some cards, the match was not violent but he showed 7 yellows. But he wanted to have all the players under control without taking much risk, because this kind of games can turn violent in seconds.
Ruiz assistant number 1, Abraham Gonzalez made some mistakes against LDU Quito, with out this mistakes they could have win even 5-0. The fouls were OK and the other calls too.
Independiente played well but they did not score, LDU was efficient in his home.