--a lot of this is based on the assumption that it's being manufactured on the fly. There's another possibility, and that is, different pre-made batches were already in existence, and are being tried out. They need storage and some care in handling, but nothing more sophisticated than that really. It could be that the wussiest stuff is being used too, as an indicator of "this is just a taste of what we have, it could get worse when we choose to do it".
Besides that, no idea, the possibilites are enormous over who is doing this or why, there are hundreds of possibilities. Motive is always the most important I think, and in this case who "could" do it is still too large a number. narrow down the motives, all the motives that are possible, not just the most popular ones. and motives come from "who profits", and what might actually constitute a "profit" in this case.
You raise important considerations; still there is no harm brainstorming the possibilities in the hope that some missing tidbit of information might be a crucial one, or that someone may have an idea that links all the pieces together that perhaps no one else had thought of. We all have a stake in seeing this thing solved.