Is it permissible to skip congregational prayer to gradually teach a new colleague from the United States, who does not speak Arabic, how to pray?

Congregational prayer and teaching the ignorant are both مطلوب (required), and there is no contradiction between them. Rather, the ignorant person is taught outside of prayer times, and then they both go to pray in congregation. However, if they sometimes conflict, and what he is teaching him is an obligatory part of prayer, such as Al-Fatiha, and there is no one else to teach him, then teaching him takes precedence over praying in congregation with others, and he prays with him in congregation. Otherwise, congregational prayer is given precedence, and then he returns to his teaching.