I have a staffer here who's a pretty smart guy, so maybe we can put him on the panel as well.
Traditionally, we don't normally just add people who show up at committee and who aren't on the witness list. If they have things to offer, they could have been pitched earlier, perhaps, and the chair could have made that decision. They could be future witnesses. I don't know.
Just as a matter of principle, I'm uncomfortable with a member of Parliament raising a point of order on the day to say that there are some people in the crowd who should be added as witnesses. That's not at all consistent with how committees are supposed to function, so let's just get on with hearing from the witnesses who are on the meeting notice.