Though wouldn't it be kind of awesome if say this group (U & J, Eric & Danielle, Joe & Bill and Teri & Ian) are nearly a day behind. And that somehow, Eric & Danielle manage by Izad's spoiled episode, to catch back up while the otherss slowly get eliminated and why Uchenna & Joyce are still so far behind in that episode.
I agree with this line of thinking. I do not believe that the producers manipulate anything except airplane flights and boardings(that flight to Singapore that would have given Colin and Christie a connection to Manila and unbeatable lead arrived just slightly too late; the momentous pull-back-in in San Juan). I think that whichever of Eric/Danielle, Charla/Mirna, Dustin/Kandice and Oswald/Danny does not get into the lead group by the end of this episode will have to move up later via Fast Forward.
There will be a reckoning in Kuala Lumpur, where the only remaining team not in my above group, Uchenna and Joyce, is expected to be 17 hours behind.
NOTE ADDED BY EDIT: Ha, ha, ha. My own words come back to haunt me. It's so obvious that the producers manipulate the "weather conditions" to prevent the dhows from sailing so that Charla/Mirna cannot get the larger lead that their risk-taking deserved.