I agree, I won't brake up anything, two batt. of Broussiers 92e de Ligne are deployed and form the right part of the 8 deployed battalion, they double up on themselves, on in front, the other behind.
Penne's report, which I could read completly, thanks to Steven Smith, Seras division porta en colonne serrée, ... gauche en tête ...le régiment formait la tête de colonne ...sa droite appuyée derrière la droite de 92e qui marchait en bataille
So - I cannot conclude that 112e de ligne was deployed, they were in colonne serrée (unfortunalty we don't know if it was by pelotons or by divisions) but the battalions in closed columns which makes sense for a bataille en eventaile - now - its right leaning behind the right of 92e which marched in line.
In case I get this right - it would mean that Serras is behind the colonne vuide of Macdonnald but forming an elongation of the column - but not directly in the path of 84e and 9e de ligne but a bit more to the left of them behind the deployed 92e de ligne.
Also this would make sense, there the whole divison Sersas was marching with the left in front and could deploy if needed to the right.
Also interesting the comment - footnote of the Belgian major Dufour in his Prècis du Course d'Art Militaire -where he describes by error that the 8 deployed battalions of Macdonald were stacked behing each other, most likley from that wrong analysation the myth about the colonne de Macdonald originated.