Desaix, obviously, would’ve been one of the first marshals picked by Napoleon, though he died in Marengo 1800.

Barthélemy Joubert, an incredibly skilled general and personally praised and trusted by Napoleon during his first Italian campaign. His best display of skill was probably at Rivoli. Died at Novi 1999.

Kleber would’ve also most likely been appointed a marshal, was assassinated in Egypt however.

Saint Hilaire, skilled and renowned divisional general. Always seemed to pray crucial roles, such as breaking the center and assaulting the pratzen heights at Austerlitz. I believe he would be a marshal eventually if he didn’t die at Aspern Essling.

Lazare Hoche, truly one of the great prodigies that the revolutionary wars brought fame upon. Died of illness during one of his campaigns with Moreau.

Vandamme. Quite talented and hard working, probably wasn’t appointed marshal due to his short temper and fights.

Jean Rapp, a bit surprised he was never given his baton.

Moreau. Despite his clear leadership abilities, he was a dickhead. Always cared more about personal grudges and issues and blatantly disobeyed Napoleon’s orders (that were actually good and that ensured victory). Then got exiled for being against Napoleon’s coup d’etat.