I'm not asking you to be an Ace Detective and spot all the little scumtells that anyone leaves.
Just speak up and share your own thoughts and not somebody else's. If they line up with someone else's thoughts that's fine, but from time to time you should be able to come up with things on your own. Do some scumhunting yourself and don't just sit back and watch other people do it. Apply pressure if you think it's needed. Get involved and play the game. That's the only way you're going to be able to get better and become more useful.
Just speak up and share your own thoughts and not somebody else's. If they line up with someone else's thoughts that's fine, but from time to time you should be able to come up with things on your own. Do some scumhunting yourself and don't just sit back and watch other people do it. Apply pressure if you think it's needed. Get involved and play the game. That's the only way you're going to be able to get better and become more useful.