A guy I know tried to sponsor Eddie Alvarez back when he was a Bellator champ. He told me the going rate at that time was $25,000 per month whether he was fighting or not. That was per sponsor. That's purely hearsay, but the guy ran a fight athletics brand, and he had no reason to BS the subject so I assumed he was shooting me straight.
If that was accurate: Factoring inflation, and 3 or 4 sponsors, plus 2-3 months between fights, he could be pretty close to Jans disclosed pay for the Izzy fight, but then there are PPV points.
I'd say Jam is comfortably doing better, but Anderson is probably doing way better than he'd do in the UFC.