No, this doesn't make sense to me.
At contact the whip should already be well underway. There should be a release process occurring. If you backchain to contact and 'push' to extension from there, then you are likely teaching something different than what should be the case.
When folks think in terms of backchaining they should be aware of the energy flow process.
Obviously I'm not looking for energy flow from that point. I'm looking to train the hands and arms.
While you may not like it, the gif's from the start of this thread demonstrate she is getting to extension far better than even a month ago.
SBC asked what I'm doing and this is one of the things we do regularly...
This is just like folks not liking the Mota drill. I don't really care whether one feels it is of value or not. I find value in it and feel it's helped her develop...CP