So, that is a couple pieces of evidence, but clearly not the whole story.
What is maddening about this whole conversation is that Ralph fires people all the time. ALL THE TIME. Head Coaches, Assistant coaches, Presidents, GMs,... you name it. Yet no one will admit that this guy must be sticking around for a reason.
What would that be? Ralph admitted the team hasn't drafted well, and he has fired everyone else in the past 10 years. So while we can make judgments from outside the organization and draw simplistic correlations about Modrak's abilities - Ralph has clearly decided Modrak has not underperformed despite the lack of drafting success. Clearly, if the simplistic correlations told the whole story - he would be gone with everyone else.
So, maybe we just don't know the whole story and people will just have to live with that fact for now.