I think Cipriani is simply a better version of Ford- able to play in heavy traffic that Ford, for all his vision, simply cannot do. Egregious mistakes can happen with Cipriani, but then Ford was never immune to them.
For me Faz has only ever looked class as 12, and England are miles better with a second distributor at twelve. We had great success with Farrell/Ford, but it went wrong when Ford lost form. The solution for me would have been to replace Ford with Cipriani back then, and continue with the game plan. Rumours, and they are just rumours, are that Farrell/Cipriani would not work as Farrell preferred Cipriani to be deployed 250 miles away on club duty for whatever reason, whether that be Ford's friendship with Farrell, or something personality related.
I have struggled to work out Eddie's selections on and forever after the SA tour, my impression from the outside is that he thought that he should have freshened up the selection and when that did not work, it bought the changes he made in selection bought a concomitant change in the game plan. I think the game plan was fine, give or take, and the issues may have come from the rumoured over-beasting of the players in training and a lack of new blood during the winning run- when matches like Italy should have allowed a bit of selectoral freedom to look at options for Brown, for example. Instead we got Daly at 15 on tour in SA.
For me the talk pre-Eddie was of Eddie being a short term boost coach who looks for attitude and no frills, which is what we got.
Once Farrell goes to ten, England lose flexibility.