If I invite others to participate in my decision, do I need to include their input in the decision?
No. Whether to make your decision based on your own judgment or the judgment of all participants is completely up to you. Even if you want to make the decision based solely on your own judgments, it may be beneficial to invite others to participate. Their perspectives may inform you of something important that you may not be considering. In addition, comparing the results based on your judgments versus the judgments of all participants may help you gain confidence in your decision.