I think all members would agree that it is a little odd--I've never seen this happen before--to have officials appear before the minister does. For the initial introduction of a bill, usually the minister speaks, and then officials are there to take some detailed questions.
I would prefer to stick with what was offered--that the minister and officials appear from 4:30 to 5:30. Then if necessary the minister and officials--not just officials, but the minister as well--can appear after our votes. I'm not entirely comfortable--and I don't know if anyone here can say that it's ever happened before--that on a bill, ministerial officials would appear before the minister would. I've never seen it happen. There are, though, people here who have been here longer than I have.