Why did the members of the Local Churches not mention the name of Witness Lee in their prayers when he was on his deathbed?

When Witness Lee was terminally ill, all the members of the Local Churches (also known as Recovery) around the globe were asked to pray for him, yet without mentioning his name in their prayers. Why was it so? Is there any specific reason in Christianity as to why names of those who Christians pray for must not be mentioned in prayers?