Thank you for your update on the 112e forming with Seras.
As for myself, the 9e Leger was a typo on my part, sorry for the inconvenience.
I was looking at General Seras’s Division and no matter what brigade you use, the 112e would have formed last according to numerical sequence. Unless the great body of troops were formed with the left leading.
One reason for forming in numerical sequence, other than for a continuity for a military system, was for visual recognition. A commander may not recognize a body of troops due to climatic conditions/smoke on the field of battle, but he would know which unit was which by number sequence.
Therefore in Colonel Penne’s report, we know that the numerical sequence was reversed.
"La division marchait la gauche en tête; le régiment formait le tête de colonne et marchait sa droite appuyée derrière la droite du 92e, qui marchait en bataille."
With this information we also know that his regiment was to the right or the 92e which was deployed.
According to the Historiques du 84e régiment d'infanterie de ligne, page 172, we have the following passage "…la division Lamarque occupait la guache, la division Broussier la droite; le 84 eut ses bataillons en colonne formant la tete de la colonne de droite."
Therefore normally the 9e would have followed behind the 84e which would have made the colonne marchait la droite en tete, since the 92e was deployed and the 112e was to its right.
Obviously you have more sources than all of us, and it is for that reason, may I ask what sources are you using to position the 9th (3 battalions) and one battalion of the 84th deployed in the Colonne Vuide?
Does Capitaine Bohain give another description of the Colonne Vuide?