Hard to choose just one of the competencies as being most important. In 2019, the new 8 competencies were announced and included a new area that was not part of the original 11 competencies. The added one is the Coaching Mindset. It has to do with how a coach 'shows up' and is mindful of ethical behavior, and attends to their personal and professional needs. I love this! Perhaps the new inclusion is indicative of what we as coaches need to be mindful of.