I love this fight, 2 face first brawlers, similar size and both with solid chins. Many reasons why it might not happen though.
If it does go ahead I couldn't pick a winner right now. Rios might be better without struggling so much to make weight or he might still be finding it hard, and against someone his own size which he's never had to deal with before. But it's fair to say Rios is the best guy Alvarado has faced by far and he won't gas out and fall apart like Prescott (but can he even outbox him like Prescott did? Probably not).