Yeah, if they saw F*K there, would they be running at all, or just jogging or walking (like Brandon & Nicole). Even Colin & Christie weren't really running when they came to the pitstop.
They are definitively running, so either they don't know their position, or they know they're not third (the second team gets a substantial prize, so there is still an incentive to run).
One thing also, we don't know how long they've been running. If you've been going at it for a mile, well your not going to be running very fast. By the way, Freddie and Kendra are pretty poor runner from what I saw in Ethiopia.
I think that if it comes to a long run, A&R have a large advantage over F&K and a slight advantage over Kris & Jon.