I am sure they did the best they could, but I think we have to be careful assuming the aerial search would have found whatever was there to be seen. The effectiveness of the search would have been compromised by many factors.
We know the bodies were well within this blue line as of June 5. That is beyond doubt. And they were not found until June 6. So they missed 50-odd bodies. What else did they miss?
We must be very careful not to close off any possibilities prematurely. I think there is a real risk of doing so if we make assumptions based on what was not see where during the aerial search phase.
The aerial search may well have ultimately been more useful if they had dropped more datum buoys as soon as possible. Then drift analysis would be based on real data rather than conjecture. Of course it was a SAR mission at that time, and the focus was understandably looking for possible survivors. Not on obtaining current data.