Wow, was that one generously arranged bunch to keep Joel & Ashley in the race!
I didn't really get Steph & Kristen logic of using U-turn. As a front-runner they have no real need to do that and as there is likely another U-turn coming up later on it would make sense not to paint the target in their backs even larger it already is. Maybe it was payback to Jillian & Emmett for breaking their Express Pass -alliance. Only reason for leading team to use U-turn would be if they know their worst rival team is suffering on that exact leg and they want to try to kick them out. Otherwise, better not use it as there is no benefit. Delaying any team is just equalized by next bunch. They were smart with Express Pass though, keep it just in case but if they clear tasks easily Pass won't help any. Any time advance gained by Pass over other teams would just be equalized off next bunch.
Jillian & Emmett did the right thing, as they were U-turned, they U-turned team they think is the weakest to make sure somebody stays behind them and they saw Joel & Ashley arriving to the market square last so they picked them.
I didn't know rigging and sailing a boat was so easy that all teams cleared it up just like that.
It is easy to see that Steph & Kristen and Jillian & Emmett are the likeliest teams in the Final Three. The last team there can be any of the other teams depending on luck when they have good legs and bad legs.
Going to Cuba is great. When TAR Australia did that on Season 2 it was truly fun.