This is not quite true for the Napoleonic Wars. Generals died in plenty, at least the French ones. Take Essling as an example. That Ney was not killed at Waterloo was a miracle, leading all those mad French attacks against the British squares.
Apart from Lannes (Essling), also Bessieres went KIA. Even Napoleon was wounded twice and would have been killed at Lodi if a French soldier had not given his life to protect him. At Waterloo Picton was killed, and Uxbridge lost a leg riding next to Wellington. I have seen somewhere that when a ship with mails met the British army in the Atlantic returning from New Orleans, there was celebration in the officers mess: Napoleon's return ment a lot of opportunity for promosals.

It is some way a little sad that this is the remains of a British soldier. I believe that they are generally buried under the lion, whereas there is as far as I know no monuments for the ten of thousands of French soldiers who died at Waterloo. I suppose that they will find a grave for this soldier among his compatriots. But it could also be a chance to establish a memorial for all soldiers killed at Waterloo.

One last thing and quite interesting. The French speaker in the newsreel about the finding talked about the Battle of Waterloo, and di not use its French name, the Battle at the Belle Alliance.

Lemche