There is so much information you can use to get to a certain theory, but I think in general the text of BEL is right.
Someone who is going for the win will use 5 points in the end, so in the previous 4 sectors he will use 7 points. A helper will use 12 points in 4 sectors. A difference of 5 for 4 sectors. In some way you have to find out to use maybe one sector the same amount (downhill is perfect). So you can use a bigger difference in other stages.
For me I check the difference in GV aswell, above 6/7 GV difference I will have a goal to keep them with my leader until the 3rd sector, just to be safe and make sure he always has a helper if the tactic of other helpers is too dangerous.
I can make a comment on something that has been said in one of the previous posts but it's not for this forum.
And probably not suited for this forum either, because he keeps bringing up things from the past and it gives endless stupid blames.
I want to prevent that. Good, because I don't want to prevent a forum to be educational and fun.