About now, I'm thinking that:
The drops (all taken together) are the graphic, and the graphic is the map, and the map leads us to a message that is unlocked by the keystone.
Or something along those lines.
At least I don't think the keystone is anything that I previously thought it might have been. Those guesses seem naive (lazy?), when you really take a closer look at the drops. Reminder: when Q is not posting, go back and read drops!
So I collected relevant/connected Q quotes into an image. I think they create a picture that helped my thinking on the question about "what is the keystone."
I only used exact wording from Qin this image. But note they are NOT in context of the drop (maybe that's a good thing, because we are instructed to read EACH SENTENCE). And they are not in any sequence (which might be a bad thing because Q says sequence is important). Anyhow, I'm thinking about things a lot differently right now as a result of this exercize.
(Sidenote: Q says “you have the keystone” (Drop 2633 from Dec 2018). But I can’t help wondering whether we really had the keystone back then, or if that drop confirms some future date when we GET the keystone (think deltas, think future proves past). Think "time." Or at least, I think.