"Please note the wording....."most optimal feedstock"
That means the very best. The next step down from most optimal....is ...optimal.....then there is acceptable.......and so forth."
I really wanted to leave this alone, but I found it to be almost impossible.
The next step down from "most optimal" isn't optimal, it's NOT optimal. There are no degrees of optimal, just as there are no degrees of pregnant, maximum or impossible. The feedstock is either optimal or it isn't. And there is only ONE optimal feedstock. If they want the optimal feedstock they have to pay for it. If they can live with something less, that's fine....but under no circumstances should they refer to it as "most optimal".
It really sounds to me like they have to pay for any feedstock that isn't unacceptable.