from what i know (historical books and such) he was Ranked among the Top 3 best Commanders in france ( in ability and Popularity) He was the only Rival to Napoleon and when Napoleon Rose to Power Bearnadotte was 1 of the only men in france that was Powerfull and popular enough to stop him (the People Loved Bearnadotte)
the only problem with Bearnadotte in france was that he and Napoleon was Rivals and did not like eachother that much so when Napoleon became Emperor he gave big commands and such to other Marshals that kissed his boots more.
For example Bearnadotte most of the time got Command of low grade Foreign trops with poor morale and poor Training while Other Marshals got better Trained French Troops for example from 1805-1809 he commanded Bavarian Polish Dutch Spanish and Saxon troops and in 1809 when he got command over a Saxon army and when he went to inspect it he found out that a big part of the men where above 50 and most Ncos above 60 most men where not capable of running for any distance but had to walk. the artillery had never Practised Towing the artillery with horses and most could not Ride a Horse
at the time he was in command of the Worse Troops in Napoleons armies and that is why he often was not able to "Win" battles when he had Trouble Keeping his men from Fleeing.
i would be happy if u added him in a update thank you
Im sorry for my bad english its not my native language
a Painting of Bearnadotte in 1804