He is just as capable, if not more so, than before the accident
How do you know that he is "just as capable"? Furthermore, "accident" is not the same as "negligent mistake." The grounding may or may not have been an accident. We PeePruners don't know which it was.
... and his training will have taken years and cost many £'s.
Maybe his training was flawed. Again, we don't knoiw.
Not to mention the loss of experience.
Napoleon I: "Don't show me a good man ( i.e., officer. ). Show me a lucky man."