How has John's in-depth product knowledge impacted the sales team's performance? What specific strategies or tools did John employ to train the sales team on the new software, and how did these initiatives contribute to their understanding and sales success? In what ways did the sales team's ability to effectively communicate the value proposition of the new software improve after John's training and guidance? What measures could the company take to ensure the continuous development and utilization of product expertise within the sales team, beyond the initial training provided by John