Having more than one disciple is absolutely fantastic.  But, the most important thing to remember is that these disciples should be met with one-on-one. So schedule them to be at different times and do not meet them together as a group for personal discipleship.

Of course, for fellowship and connecting as a group is no problem.  But any time you add more than one person to meeting together in one-on-one it becomes a Bible study, and not discipleship, and the dynamics involved are very different.