Jose had a horrible start to the season coming back from a broken hamate. The last month he was more of the player we were accustomed to seeing, an .888 OPS and a 132 wRC+.
I understand the 40man aspect of it, but I think their point was if they literally just wanted to call someone up as a warm body on the bench, why not call up literally anyone else (like Erik Gonzalez or Yolbert) and just DFA them when/if you need the spot? They didn't need to promote him to sit on his ass for a week while he was in a groove at the plate in Birmingham.