My take: it is already known this is a BIG findAs evidenced by the activity starting and going on that would be in keeping with a big find.
Example: when Disney decided to open in Orlando decades ago they kept it quiet in order to buy up surrounding land and properties.
Likewise we are seeing a heck of a lot of high activity in Namibia that would only make sense in there was to be a huge oil find. Examples: the Chinese coming in big time to modernize and secure their port, the Army starting to be beefed up dramatically, highways and railroads being enhanced greatly, etc.
So my take is that it is known by insiders that this find is real and they want to get in on the bottom floor before this all takes off big time!