Not long ago, there's a small trend of this rotational Bible Study leading attitude.
When nobody has any comment, the leader(s) would even dare to say: If no one has anything to say, then I will also keep quiet, and we all just wait until the time is up.
First of all, even if the group is made up of children, one doesn't lead in such a way. Secondly, there are quite a few seniors in the group I was attending - This is very disrespectful to them, especially when this guy is about half their ages.
Last but not least, at that time I was going to response, if asked, "You're the one leading, you've prepared for it, if you don't have anything to say, what could we say?"
Now, I would just respond: Who says one must make a comment?
Conclusion: This attitude arises out of pride and ignorance. Pride, because the leader believed that his time is more precious than others - that he could waste everyone else's time. Ignorance, because he does not care about the spiritual nourishment of the group, he's only here because he was asked to, nothing more.