Shame on me, I did not realize that Rilliet's account continued beyond the first section I analyzed!
Rilliet de Constant . “Les Cent Jours en Belgique.” Bibliothèque universelle de Genève. Nouvelle série 35 (1857): 352-354.
It is so great to have so many sources available online, but did I mention there are so many sources online?
I find Rilliet's account to be the most believable - but a French friend thinks it was overtly political.
But what to gain in 1857? Do we know when it was written versus published?
And it is so precise. Rilliet supports the theory that during the march to Florennes from near Chimay, Bourmont/staff hustled ahead to Namur, and dropped off servants and baggage, and then Bourmont returned by evening to Florennes.
However, had Clouet been left behind, he could have tipped off the Prussians, and maybe did so acting on Bourmont's behalf, or acting as Bourmont. (Levavasseur wrote about Clouet's willingness to disguise and forge in an unrelated incident.)