It is very disappointing, but if it has to happen, I'm thinking this is not the worst tie to lose. It looks highly doubtful that Raonic would be back playing in time for World Group playoffs, and without him I don't see us being competitive. And if he is just venturing back onto the courts about that time, he doesn't need the pressure of the call to Davis Cup duties (and playing Davis Cup definitely wouldn't be a good reintroduction to competitive play).
Hopefully Bester and Pospisil will learn a few things from their experiences yesterday and put them to use in the future.
Another reason for benching Pospisil is fatigue. He was clearly done after 3 sets yesterday - I just hope he is recovered enough to do the necessary in the dubs today. I can't imagine he will have anything left for tomorrow.
They're not in Quito - they're in Guayaquil which is close to the coast.
Oh my bad, I just assumed they'd play it in Quito, they often do. Still, closer to the equator, g is still 9.79 instead of 9.81 in Canada, which does make a difference. Although less so than it would have in Quito.
My guess would be (a) he is not used to running around so much at the baseline, (b) he used up a lot of nervous energy that contributed to his sense of physical exhaustion, and (c) maybe he isn't as fit as he needs to be for 5-setters.