That's a very good roster but uninspiring relief corps. I'd expect the Cubs to make a big addition near the deadline.
Why do you say that? Fangraphs has the Cubs ranked as the 6th best bullpen in the Majors. Third in the NL behind the Brewers and Dodgers. Morrow, Cisheck, Edwards, Montgomery, Strop and Duensing is a ridiculously good pen. If Justin Wilson regains form, it goes up a notch even higher. If Grimm figures out how to use his two out pitches to actually get outs, it’s even stronger than that. Drew Smyly might be available for added depth come September and the playoffs.
Yeah, the Cubs will probably add pen depth at the deadline. They’re going to be competing for a playoff spot and that’s what playoff teams do. But, barring major injury, I don’t see them needing to pull off a Chapman-style blockbuster. It will be more the Tommy Hunter-Joe Smith type trade.