In a situation where a group is having difficulty in hearing a particular perspective, you might choose to give one or two people focused attention to help them express it. You could support them with clarifying questions e.g. "What I think you're saying is... Am I right?" or "When you say that we 'aren't pulling our weight", can you say more about what you'd like us to do?"
Be wary of interrogating someone, or asking them to prove themselves - the aim is to support them to put their message across, not to pull it to pieces! To give the person as much control as possible over what they want to put across, ask open questions which don't have yes/no answers. For example. "How are you feeling about that?" or "Can you explain more about why you are worried?" etc.