In the JDZ ERHC had a share in what could have been 10 billion bbls of oil, not 600 million bbls. In the JDZ ERHC had a full carry all the way to first oil, not a partial carry on a single well. In the JDZ oil prices were far higher than they are today, not at the lowest prices in a few decades. In the JDZ ERHC had 4 wells being drilled each with a greater chance of success than the single well being drilled in Kenya.
Like it or not what ERHC had in the JDZ is not comparable to what ERHC has in Kenya.