Sure, the Rockies are going to trade Scott Oberg, their most reliable reliever last season and likely closer for 2020, to the Houston Astros. If you believe that, you must have missed just how bad the Rockies bullpen was for stretches of last season.
Oberg will be 30 by the time next season starts and, after recovering from a blood clot in his right arm, every discussion about the back end of the bullpen in 2020 will start and end with him. Carlos Estevez and Jairo Diaz showed their worth last season, but they will very likely be setup men for Oberg.
Could the Rockies get by without Oberg? Sure, but losing a reliever of his caliber over the last two seasons (a combined 14-2 with an ERA of 2.35 in 114.2 innings pitched) makes zero sense. It’s like asking someone if they could get by without dessert in 2020. You could … but why would do that to yourself?
Colorado needs reliable arms in the bullpen, not possible arms for future seasons. It’s that simple.