Easy to understand:

Adonis is at the end of his career. GYM, his promoter, did try to cash as much as possible before his last showdown. THey did with success. He'll fight Kovalev as his very last fight (likely) next year, likely to lose (though he has the power to knock down the Krusher, we never know). It's all about managing the last year of his career wisely before the final bout and I agree that it's a tad sad, though understandable, that it works this way.