Isbitz family tradition, as you will find in the introduction to Living Waters, relates that they wanted to make Reb Mordechai Yosef the successor to the Pshisker Rebbe, but he refused. As is known, the Kostker eventually secluded himself in his room adjacent to the house of study for twenty years, occasionally appearing in the doorway and putting the fear of God in his students so as to prompt them to jump out of the windows. Four in the morning. The Kotsker has not been seen for a week. Suddenly in the darkness he has the gabbai wake up all the Hasidim and calls them to the house of study.
Beryl turns white.
In this way the Kotsker, more an angel than a man, was trying to create a community of angels. Reb Mordechai Yosef saw this as a dangerous experiment and fated to fail. God has enough holy angels, what he needs is holy men. Eventually he left the community of Kostk, and moved to the town of Isbitza, taking many of the disciples at Kotsk with him. There he taught the ways of Ahavat Hashem, the love of God, and Ahavat Yisrael, the love of Israel.