Thanks for the sources on those guys! I had not found them yet...
Yes, very familiar with Rilliet and as you point out, his account is basically 100% at odds with the conventional Bourmont account. Also, Rilliet is the only source to explain the disposition of baggage and servants. The servants are the unknown actors of the Waterloo campaign - they were everywhere... English accounts speak of them most freely, but only a few French. When Bernard did his recon on the right flank, his Servant was apparently with him dodging bullets. Coignet has a servant with him during the campaign, but we only hear of his existence when he was let go (after Coignet went on half-pay).
Question: did Officers in the Prussian army have servants with them on campaign? And did they accompany them on the battlefield?
Conventional Bourmont account has no substantiation, and what Hulot reports is refuted by Rumigny who spoke with Chasseur escort.
Why would Clouet lie, why would Rilliet lie? Of course, any of them could lie...
The entire conventional history of Bourmont's defection is a whitewash that relies on Hulot, and was promoted to denigrate Napoleon - see Charras. When Hulot's report to Gérard (written in 1818 I believe) was finally published, the editors removed significant material about Bourmont so as to not stir up long since buried problems/emotions (I forget exact language.) Whoa! What did Hulot say that was sensitive!? Couldn't have been, "Left at 5:30 am and said nothing." That was what they did allow to be printed.
Do you think it is reasonable that someone, over time, would forget June 15th has commencement of hostilities? To me, that would be like a Normandy veteran forgetting it was June 6th, and if they did, wouldn't someone remind them?