Card Rulings talk:Jurrac Guaiba

If Jurrac guaiba attacks into a face down ryko will its effect activate ? I think it will because the activation conditions of Guaiba's effect are met as it doesnt need to send ryko to the grave like Shura or firedog, it shouldn't matter that Guaiba is not face up on the field, the activation conditions have been fufilled therefore the effect will resolve, correct ?