It is very unlikely for JB or the other brine projects to move AKE SP much until it is near production if it is not a transformational resource.
This is very much the standard for any producing miners with good to decent side projects.
The only times SP gets a major boost is when the new tenement/find is multiples larger, but even than it is not as much as a standalone single proect miner.
If JB was a standalone this annoucment could have shifted a pre DFS Explorer cum Miner 25% and up
However when the time comes ie 6 to 12 months out, the valuation for the project starts to rerate.