If any team member advances faster then you do,first congratulate him.Send him a $5 Gift Certificate and some T credits.When he spends them both, you will be an awesome sponsor to him.
That way if he thinks of leaving later, he will be encouraged to stay.
One the the things that sets SFI apart from all the other similar companies, is the fact we do not loose someone who does better than we do.This is one of the facts that helped me choose SFI myself.