If you want me to elaborate, I will, but I do not recommend trying to juggle 10 companions. It is not easy, and a single screw up can result in half of them leaving, which can mess you up for a game month or more. You can have ten companions without anyone leaving, with a lot of planning and perfect morale control.
There are four 8 man groups in Native, and those are rock solid. You cannot have more than eight companions without at least some infighting.
