Montero was, is, and remains better than Baez at hitting RHP. So if you're saying it's justified to have Montero hitting 5th on this team, then this team is nowhere near as good as you'd like to pretend. If La Stella or Coghlan isn't going to be in the lineup, then the Cubs have 4 guys who are great at hitting RHP, a handful that are okay, and whatever you want to call 2016 Heyward. This is less an indictment of team quality and more a reiteration that Montero serves a perfectly useful purpose even if he's not having a good year.