The problem was they weren't going to be able to get L/L matchups when it mattered. All the guys he could have been brought in to face were switch hitters, some of whom are better from the right side.
Definitely wasn't going to come in to face Ramirez and possibly Lindor right-handed instead of Sims. Bell didn't want him facing Reyes in the top of the next inning either.
Once he'd warmed up, it made no sense not to put him in the game after Jones faltered. He needed the work and they were still in it.