Even before the Lotus Sutra the Buddha intended his disciples to actively engage in teaching and transmitting the teachings. The difference in the Lotus Sutra is that now there is nothing being held back. The Buddha has broken down all the barriers and finally agreed to reveal the fundamental truth of all Buddhas. It is to this that Many Treasures Buddha responds based upon his vow. When we teach others about the Lotus Sutra we call Many Treasures Buddha to be witness to the truth we are sharing. You could say the magnet to attract Many Treasures Buddha is to teach others about the Lotus Sutra.