Difficult to say, he had a lot of tasks, like to prevent desertion - he did wear NCO stripes, the famous "sardines" at the fore arm8 in whool in contrast to the "metal" ones of the Sergents etc., also he did carry a sabre as distinction along with the usual fusil d'infanterie, - in contrast to the fusiliers - who did only carry a bayonett as side arm - but when in rank and file he would do all movements as rank and file, i.e. he would fire as well, so he was no file closer.
He could be employed as NCO and then was ordered to carry the musket in NCO fashion. A caporal was also the wing man of each section, of the first section he would be at the left wing, on the second section he would be on the right.
So technically not an NCO.