The AAIB report is mainly there for us to learn from and we should do this. I have no idea if the coroner's report will be a public record, if so, i hope someone will post it here, also for us to learn from.
I am assuming the AAIB concentrates on the aviation aspects and the coroner may have a different view as he is more "mainstream" in his evaluation.
The two combined may well end up teaching us all a good lesson on both the responsibilities of being PIC (including what decides whether you are P1 or not) as well as the effects and consequences of outside influence.
If the coroner is able to engulf himself sufficiently in the GA aviation and it does not become a "rogue" verdict, at least Mr Walkers death will have served some purpose in making flying a little safer and this may help the closure for his family and friends.