There is no point in having an in depth theological debate on the merits and demerits of Esau's actions without relating it to ourselves. Some people have a tendency to do more talking than others do. There is no harm in this as long as other people are not denied the chance of talking because of them. However make sure the person or people doing the most talking are not going off point. When leading a group pay attention to body language.
Some people just speak out.
Others either raise their hands in an attempt to speak or just look at you seeking attention to speak. Those who just speak out tend to do more talking. The time allocated to the bible studies should be known to everyone before the discussion begins. This can vary from one hour to half an hour. It depends on how much you have available.