https://www.si.com/boxing/2017/09/15/canelo-alvarez-gennady-golovkin-odds-favorite-betting-line
However, according to https://www.forbes.com/sites/joshkatzowitz/2020/03/17/canelo-alvarez-vs-gennadiy-golovkin-3-odds-show-canelo-as-a-large-betting-favorite/.. if there's a trilogy, Canelo would be the heavy favorites.
No surprise there. Gennady Golovkin is nearing 40 and his body and reflexes are not the same as it was in 2017. And I can remember the first fight, when GGG showed a lot of fatigue towards the end (but still he outplayed Canelo in at least 8 of the 10 initial rounds). The same happened in 2018 as well. Now there is not much of a chance for rematch, as Golovkin has fallen out of favor with Golden Boy Promotions. He is currently under a deal with DAZN for a total of 6 fights and won't be able to take part in a rematch with Canelo until the deal expires.
So this means that Trilogy will not happen anymore, it's just pity that we are supposed to see a good fight but since there's no chance, then we will just be seeing fights of Canelo that he will dominate easily. Thing is, Canelo keeps fighting, and although his opponent has some quality in papers, but in a real fight you don't see the real competitiveness.