I saw different variations how to perform the rise in the basic steps of Bolero. There is a strong rise on step one. Is this rise only done by straightening the leg and the body or is there a footrise also - resp. to the balls of the feet?
Are there different opinions about this topic out there among top couples?

I've been taught to keep my heels on the ground and simply rise with the straightening of the leg. If you try to rise like you would in waltz, you risk losing your balance.

That´s what I´m told as well. But I saw a video where a couple (and they must be champions the way they danced) rose to the balls of their feet. And they achived a very effective and nice looking rise and fall with it.
They accomplished a good balance by anchoring their free legs a little longer than normal.

My questions are:
Is it wrong to rise to the balls according to a technical guidance?

Since I don´t compete in Bolero I have little knowledge on judging technical issues.

If there is no such thing like a "technical bible" out there maybe there is more than way to dance it, depending on whom you ask!!??