For Exeter - yes - best chance of having him on the pitch for Exeter.
For IFW himself - I don't recall him going public with an opinion - but as the patient, his word is final, whoever's giving him the advice. As a medical student, he's also in a better position to make that decision than any other rugby player (barring practising Drs/physios)
For his health - Rehab is the preferred option 80-85% of the time, with surgery the backup plan if you don't get the desired results with rehab (but having those few weeks of rehab improves your chances in surgery).
If England muddied the waters, and ended up with a better decision for his health - I'd call that a win, even if the rationale wasn't altruistic.
For myself - I'm not in possession of the details of this specific case, but the generalities are my job.
Anyone who ever expected the new partnership and central contracts to be a land of milk and honey, and fully agreement over everything - they were living in a dreamworld. The whole reason the RFU wanted this extra say is because they so often disagreed with the clubs.