Article VII Section 15 spells out the truth. There's a Constitutional Ban on GMA's appointing powers, and that began March of 2010. Corona's appointment was made days after the election, May of 2010. From the very start, Corona's post was flawed.
Our laws do not spell out one rule which might have stopped GMA from doing all these things. That ONE RULE, I believe, is a moral virtue one has to uphold at times like this – it's something we call delicadeza.