I dont think it was them swallowing up ocz that hurt them, they got them simply for the tech and no so much the company, it was more the trend a while ago to basically buy each other to see who could be the biggest.
So ye buying ocz might have nudged them over the edge, but they could have really pushed forward with it, i just dont think they knew exactly what todo with it once they got it, they just wanted tobe the biggest just for the sake of being the biggest.
What really sent toshiba over the edge though was them going into fields that really nobody has a clue why they were going into for, like nuclear.