The big things I would disagree with are kicking stats, because for most of the last few years England have played with two kickers - Ford and Farrell, and Farrell kicked. When Danny did get the nod at ten, allegedly saving Eddie's job if you believe the scuttlebutt, Farell was alongside. If he was going to be selected it would be with a ten outside him most likely, as he had at Wasps and as England generally have done. Thus the kicking stats of the actual kicker are what matter, as he would be the back up.
The other thing is not the focus of the argument, but it is Youngs. To compare Cipriani with Youngs seems odd, as Young's huge number of caps is the number one thing that is held against Eddie as an example of his intransigence, and Youngs has made egregious mistakes on the field and in interviews after that Danny would have been nailed to the floor for. Farrell would be a better comparison for obvious reasons. Farrell's mistakes have tended to resolve around tackle technique, or lack of. Aside from that he would illustrate Healy's point better.