I have no doubt that the infection and antibiotics made harder a weight cut that is already consequential.
But there is a deeper problem with BSD, he carries a shitload of injuries for a guy his age. He needs to review his training philosophy.
The culture in french army (despite the white flag memes) especially special forces, is to always force through pain and injuries. It's fine for the army because they retire most guys after 5-10 years but they age at 3x the normal rate and lots of them are crippled at 40.