On the matter of promoting people above any of the top three, I think it's a bad idea, regardless of who the potential promote is. If you do promote someone, and they fail, then you've got guys like Trott coming in later in the order, with even less time at the crease. In such games, you would want Root, Morgan and Buttler getting decent time at the crease, so by promoting Bopara to three, you leave yourself with the possibility of Trott coming in as late as 7, assuming Bopara stays with Cook or Bell for a while. You're much better off just sticking a guy like Trott in the place he's most likely to do well IMO, and that's in the top three.