Teacher card - Mary Greer

I hope this is the right forum for this question. For 2025 I have started doing daily reads for myself and wanted to dive deeper into Mary Greer's work. I calculated my Soul and Personality card to discover I don't have Hidden Factor card, but a Teacher card. In her explanation, I don't follow. I am a 19,10,1 in her constellation chart.  If I understand correctly this means I don't have a shadow, but a life lesson to focus on. However, in doing some research I see the Teacher and Hidden Factor terminology used interchangeably. I was hoping for additional reading to better understand the distinction.  I found this quote interesting about 19, 10, 1: "In this pattern, you consciously trust that life brings you the experiences you need to achieve your purpose. At worst, lacking the determination developed from dealing w/your shadow, you tend to drift through life, never to use your abundant talents." Does this mean the teacher card is also the shadow card? Any guidance is appreciated.