Once upon a time there was a young man called Chris who lived in a castle in the magical land of Monaco. Every summer he would travel around Europe in a big black bus and enter bicycle races. He was very good at them because he was so thin and his bones were hollow as they had been nibbled away by snails.
He won many races but really wanted to win one called the Vuelta a España because he had come second so many times... [Sorry can't keep this up.]
What do you think of the bonus seconds situation? They brought it into the Tour a few years ago but it didn't effect the overall too much, reason being that many of the flat stages get taken by breaks and sprints. There are fewer uphill finishes and a good amount of timetrialling. That is more than enough to neutralize the bonuses. Although that sprint on the runway had Froome rattled.
The problem with the Vuelta is every other day is a wall to finish. his rivals just need to mark him then outsprint him. There aren't enough TT miles and the team TT rather equalizes the top teams. Does Froome have much chance of winning if he is followed by a Spanish gaggle that will gang up on him? Is it a fact that he would have already won apart from the bonuses?
TL/DR bonus seconds format doesn't suit Froome.