I do know that he & Steve were closer than anyone else in the company could be. There was a very deep connection between them that transcended words. Imagine yourself in his position now that Steve is gone. He faces true emptiness, a void that's not easy to live with. Especially since everywhere he turns there are reminders of Steve.
The burning desire he had to return to the UK has not been quenched. Temporarily halted through Steves convincing stance, but now things have changed. The inevitable has been realized as he watched Steve slip away, the man surely experienced what most of us do when losing one in that way.
After years and years at Apple, now without his respected partner, I wouldnt blame the man if he decided to leave. Life is more than work & money. Nothing like death, brings that home.