In adding to my post above, it looks to be a struggle between a conservative priest, and the more liberal administration. The liberals won.
"Liberals" are people who reject Church teaching for their own secular purposes (such as "Catholics for Choice" and usually related to birth control, abortion, female priests).
There are essentials in Catholic liturgy, and there are areas where variety is allowed. All liturgies have time for singing and times for silence.
The Catholic faith allows for dynamic differences in non-essentials. Thus, someone who prefers a certain type of liturgical expression like a Father Fessio, remains on faculty, teaches at the school, and continues to be a big part of it.