I think it comes down to what Martina Navratilova said about Andy at the AO. In my mind that still applies. Andy has a lot of variety in his game in comparison with a player like Nadal. With Nadal it's fairly simple, he will play certain shots all the time, so he doesn't need to make the sorts of decisions Andy has to. Andy has choices in his shot-making, but the issue is that when you are out for a time it takes a while to get back into making the right choices in the right moment.
Andy doesn't need to change what works, not in terms of coaches, hitting partners or whatever. He just needs to be patient with himself and keep going and it will click again.
Andy was injured for two years. In that time he's had to alter the way he plays to a point. Now he's injury free he has to adjust. He just needs time to trust his body, but he also needs matches so the natural instincts come back. What Andy should not do is make changes or panic, because if he does it will be a disaster.
Im not sure its such a good comparison vs Nadal. Rafa hasnt won his far superior major haul by accident. I think its fair to say he has displayed alot of variety to his play at times to win big matches.
That said, Andy is a very talented shot maker ...which makes him such an effective counter puncher. When on form he shows so much flair...which part of reason I am such a fan. The strange thing is Ive seen him play brilliant tennis and lose in the the past.. yet he has achieved his success playing 'clinical' tennis rather than brilliant.
I think Andy and his team should focus on getting his basic game right ..build his own confidence back up...then try the plays he hasnt been able to do prior to surgery.
At the end of the day ..no back surgery is minor... especially for an athelete competing at the very top of their sport. Could be a long haul yet to reach his best tennis...