Personally think he's doing a decent job as DOR, given what he was up against when he joined and also effectively learning on the fly. He's still finding his feet as a DOR and should have been left to continue gaining experience in this role, so to throw the job of Chief Executive his way on top of that aswell, a role which he will have even less experience and knowledge in, seems a truly bizarre choice. I'm sure AT is guiding him and mentoring him along the way, but would have preferred to see a more experience hire in this role.
Learning 2 such important positions simultaneously will not be an easy feat for the guy and could very easily lead to dropping the ball somewhere.