I am quite familiar with the strengthsfinder and strengths related methodology, hence my investment in the book. I was unclear about design thinking, and found that my understanding of design thinking has vastly improved after reading this book.
The application of strengths is shown through the author's experience as an Olympic Ice Skater. So the book is based on hindsight. It's great if you are into this sport, but not much use if you aren't. So in my view, some chapters could have been written differently, particularly chapter 8.
The author also doesn't show how a tool like Strengthsfinder (which he mentions in the book) can be used to apply strengths in a non-sports situation, which is where I have seen the need for people to actually use and lead with their strengths. So while some areas of the using strengths are mentioned, such as the flow zone, an application of strengths in daily routine behaviours would have made this book extremely strong.
One of the learning areas in the book are the short interviews or insights from other professionals who are extremely proficient in design thinking.