Very interesting. However, there seems to be a contradiction here.
Matthew Thomas wrote: "A descent is in accordance with the will of the Being."
In that lecture, Master Samael mentioned that those who descend "take a spouse when it is not permitted to them." That seems to be something which the Being would not do (since it knows the rules and does not break them), so it can be said that falling and descending would both be things that the Bodhisattva would do against the will of the Being.
Also, there seems to be no mention of what the actual difference is other than a descent not involving orgasm. I know that the fallen Bodhisattva's egos revive and that person becomes chained again to the wheel of Samsara. However, does the same thing happen to the descended Bodhisattva?
If descending is the less painful method of making the philosopher's stone stronger, why would anyone choose to fall and go through such immense suffering?