That's very possible but it's not that big of a deal to fly to Calgary and then drive to Banff which is only a couple of hours away. It's a beautiful drive. You could be right that it's from the previous episode though. It will be nice when we have a description.There are 3 RC's in Canada, one in Vancouver, 1 in Whistler, then the 3rd in Banff.
Now I think that description that you are going by is a general first of the season description to give us a general idea of what will happen this season.......at least what the producers want us to know ahead of time. I think that when they leave Whistler, there are 6 guys in total.......it don't make sense to leave one guy behind in Whistler to catch a flight on his own to Calgary, then turn around and drive to Banff in time for the next rc.
Edited to add that we don't know if the guy with the 1 on 1 gets a rose. Maybe he doesn't in which case it makes perfect sense to have 6 guys left for the train.