Susan Howard did an outstanding work to translate a lot of Titeux's work on this subject. In case one is reading all 19 artciles one has to share the conclusion
This makes it plain enough: Napoleon, having blundered in his attempt to take over
Spain and impose his brother as King, had suffered a blow to his military and political
prestige and needed a scapegoat. Dupont must be burdened with the sins of others
and driven out into the wilderness.
I still wonder what made Napoléon to react like this, it must be more than just Bailen. The relationship Dupont - Bonaparte seems to be strained since the campaign of 1800. I cannot see any divisional commander who served more brialliantly than Dupont up to Bailen, first class military record - outstanding performance - and then the heinous reaction by Napoléon - who showed his ruthlessness also before dealing with Moreau and others, Lecourbe sums this up well in April 1814.
The best would have been that Dupont should have handed in his resignation after Victor was imposed to take over 1er coprs, which he would have deserved to command.