Chicago Cubs organization discussion

I am now working on the Houston Astros Top 20 prospects list for 2018. The next team in line is the Chicago Cubs, to be followed by the New York Yankees, Arizona Diamondbacks, Oakland Athletics, Washington Nationals, Cleveland Indians, and the San Diego Padres.

Use this thread to discuss the Chicago Cubs organization. Possible points for discussion include, but are certainly not limited to:

****The Cubs finished 92-70 in 2017, first place in the National League Central and a successful season even if it didn’t result in a World Championship this time. What do you see for 2018? 90+ wins again?

****What are the biggest holes that need to be filled, and how would you go about filling them?

****Is Kris Bryant at his peak now or can he actually improve?

****When will the efforts to add pitching to the system bear fruit?

****True or False: 2017 first-round pick Alex Lange is actually an under-rated prospect.

****As always, feel free to discuss prospect sleepers or anything else Cubs-oriented.