How do you know that they didn't get the information?
I could see quite a lot of motorcycles holding boards up with information, the teams had people holding boards up as well. Just because the information wasn't provided to the TV-audience doesn't mean it wasn't given to the teams and riders. The distance was the same for 15-20km towards the end, they just didn't have the strength to catch them when the Spanish and Swiss joined forces up front to keep up the speed.
Cav was the favourite, but I'm guessing the British media overrated by how much. Norwegian media had them as favourites, but had concerns about them during the race and were actually impressed by how long the racers that were almost just back from the tour managed to keep leading the field almost on their own. In the end they just ran out of steam.