You partly guessed what I was going to say, but I actually think this committee is demonstrating the ineffectiveness of the rules. It is attempting to figure out the reason for the game after the game was played.
As elected representatives, you hold the government to account, and now you are trying to ascertain whether the reason for proroguing Parliament was appropriate, but I think the time to ask questions was before Parliament was prorogued. That's what I would suggest. The time to ask these questions was before prorogation, not after. Otherwise, it's simply a matter of interpretation and speculation.