What should also be taken into account regarding Jomini are the facts that he was never a French colonel (even though he presented himself as such), which indicates service with troops, but an adjutant commandant, which is a staff rank. They are equivalent in grade, but not in function.
Jomini was a staff officer, and in that capacity he was a failure as a corps chief of staff twice and twice as a military governor.
Combine those facts with the fact that he was also a deserter and a renegade, and you find little to admire in the character of Jomini.
Two allied officers, one English and one Russian, rendered opinions about Jomini that were not flattering. The Englishman, General Stewart, was a representative at Schwarzenberg's headquarters and 'considered Jomini an unnecessary nuisance.' He succinctly stated that 'The presence of Jomini...complicated and hindered everything.' The Russian officer, General Toll, described Jomini as 'not fit to serve in war.'
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This is an excellent article on Jomini:
Jomini: Disciple of Napoleon? on JSTOR
There is a shorter version here by the same author written a little over twenty years later:
Amazon.com: The Superstrategists: Great Captains, Theorists, and Fighting Men Who Have Shaped the History of Warfare: 9780684183534: Elting, John: Books
Jomini, as well as Clausewitz, are both covered in Chapter VII, 'The Gunner and the Gunner's Disciples.'