They specifically mention his focus on PC and his replacement was head of mobile before. The obvious explanation to me is that the company has decided to focus

They specifically mention his focus on PC and his replacement was head of mobile before. The obvious explanation to me is that the company has decided to focus on mobile, since that's the mass market play. That would've required Iribe to devote a large portion of his time to mobile. Maybe he just wasn't the right person for that job.