Thanks for sharing your thoughts on this, I have looked at the information out there online and in many case evidence of greening does not seem to be clearly defined in the online guides, and there is great variation in the example photos that show greening on fruit.
In my reading on HLB I had missed the tendency of them to turn orange on the top half first, some of my fruit on this one tree are bit green blotchy but tend to favor green on the top half. My concern was primarily based on this only occurring on the one tree, and not any of my other Satsumas, though each one is a different variety, this one has thicker more pebbly skin and often more pear shaped fruit, it is also usually the least flavorful of my trees, though the one with the largest fruit.