Interesting. You notice in those highlights how fast he gets rid of the ball? As soon as he finishes his drop back he is throwing it. Also, look how fast his pocket is collapsing.. in many of those throws, if he held that ball another 1/2 a second, he would be getting smacked. That is where Mariota has a major issue. That and stepping in the wrong direction almost every time.
Another thing... In many of those plays, if he HAD gotten sack, it would not have been "his fault". But, he didn't get sacked, he made a play instead. Good qbs make those kind of plays. Mariota does not. He gets sacked, even though "it isn't his fault".