I can’t imagine they have not had conversations to release value on some of these other directions, but I would guess that the value paid by BP go way up with an already approved product and a cash flow positive company. They have to decide how long they want to wait, or what deal or deals they can get when.
I agree they can’t do everything that is possible alone at the current time. That delays development overall and many will be long gone before the potential is realized if they hold on to it too tightly. On the other hand, I imagine they believe, and I think realistically, that it takes a very careful and patient team to develop this kind of technology and handing it off to BP that has numerous failed trials without too much thought, is probably not great. They probably want to be very careful on the handovers in terms of the partners.