And if I might toss in some more uninvited speculation, I would posit that the empty iPad station in the Brook & Claire memory-challenge shot belongs to Jill & Thomas.
Nat & Kat have what seems to be a plywood divider just to their left, which is not visible in the B&C shot. Also, Jill is looking pretty much straight over the iPad, which should just about line up with where B&C are looking if she were standing on the left side of the empty iPad station. Nat & Kat, on the other hand, are looking sharply to the left, which would imply they are to B&C's left, angled slightly to whatever everyone is looking at.
This could mean that J&T are the lagging team, which would make sense if they had to stop for directions.
OTOH, this could be fantasy on my part.