I'm not sure the Rockies would make that trade. There's going to be a lot of competition for Gray alone without throwing Estevez into the deal. Gray only has 2 years of control left vs 3 for Willy. Gray seems to have fallen out of some favor there plus the trade saves them some money (something they’re trying to do apparently). Estevez is like 4th or 5th in the pecking order for their bullpen arms, he should be attainable. The Rockies desperately need some bats, they only had 5 players provide positive offensive WAR last year, Wes Pearson (a pitcher) was their 6th most valuable offensive WAR player. Yonder Alonso had the 6th highest wRC+ for them, 2 of their top 11 players by wRC+ were pitchers, we think we have depth problems but they’re on another level. With the money committed to Blackmon and Arenado they can’t really just bottom out and I’d assume they’ll keep trying to win, Contreras makes a lot of sense for them to add. Their catchers were 28th in MLB in WAR (-1.7), they combined to hit .239/.316/.349 with 9 Dongs and a 59 wRC+. While I agree that Contreras makes sense for the Rockies (and almost any other team), I don't think the Rockies will be trying to contend next year. From MLBTR: Colorado owns one of the majors’ least impressive farm systems (per Baseball America), and dealing Gray could help the franchise improve its class of pre-MLB talent. Moreover, the Rockies doesn’t appear likely to contend in 2020.