Contreras has a .692 OPS in July, .518 since the break, and Lucroy is a much better defender/framer. It is true to a very significant degree. I'm not big on arbitrary end points (I mean, I'm happy to look to splits like that to look for signs of progress and whatnot, but definitely not for making big picture roster decisions). I know Lucroy is 30, had a bad year just last year, and given the ~96% chance at winning the division already, doesn't change things much this season. Add in Willson's age and contract status and it isn't even a close call for me. EDIT - And while not on Lucroy's level, it's not like Contreras has graded out as a detriment as a framer, so far. Let's look forward then. ROS ZiPS has Lucroy as a .339 wOBA compared to .306 for Contreras. Plus the defensive impact means that Lucroy is going to be a far better option. I'd personally rather not make that move given the likely cost, but there's little argument that the Cubs aren't better with Lucroy as the catcher this year and next.