What is the fine-grained topic of the following text: This was really a stellar year but to think the Cubs could continue to limp deep into the playoffs, with no real closer, a healing Pedro Strop, a hesitant Kris Bryant, and two of the five starting pitchers from the beginning of the season completely out of the picture, well, it wasn't likely. Only return the topic.
Challenges facing the Cubs in progressing in the playoffs