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)
"If the Buddha-Nature is seen, there will be no seeing of a nature in any thing."
(Nirvana Sutra, T12n374p521b3; tr. Yamamoto)
"Neither cultivation nor seated meditation — this is the pure Chan of Tathagata."
(Mazu Daoyi, X1321p3b23; tr. Jinhua Jia)
"With sudden enlightenment to Tathagata Chan,
The six paramitas and myriad means are complete within that essence."
(Yongjia Xuanjue, T2014p395c14; tr. from "The Sword of Wisdom")