Cubs: Willson Contreras
Easily the most battle tested and veteran option would be Contreras — who in his seventh season has shown consistent power and production. His stats would greatly aid the Astros down the stretch in terms of run production, as he is currently slashing .278/.401/.530 with nine home runs and 21 RBI this season so far.
Contreras’ downside, however, is that he is set to become a free agent in 2023, and so could become another two-month rental at a high cost to the already depleted Astros’ farm system. For that reason, I would prefer either of the younger options in Melendez or Stephenson.