It looks more like a song contest to me. The order in the video actually is:
10: Rinzai, singing: Hakuin's Song of Zazen
9: Soto, singing: Great Compassion Dharani
8: Tendai/Nichiren (in Tendai temple), singing: 14th chapter of Lotus Sutra
7: Shingon, singing: Rishu-kyo (Adhyardhaśatikā Prajñāpāramitā Sutra)
6: Nichiren/Soto/Tendai (in Nichiren temple), singing: 16th chapter of Lotus Sutra
5: together singing the Heart Sutra
4: Shin, singing: Shoshin Nenbutsu Ge (Hymn of the Nembutsu and True Faith)
3: Soto Zen: Kannon-gyo (section of Lotus Sutra, ch. 25)
2: Jodo/Shin, singing: Infinite Life Sutra (Larger Amitabha Sutra)
1: Jodo/Shin/Tendai, singing: Amida-kyo (Shorter Amitabha Sutra)
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)