No, I mean simple concern. He expresses it towards Gordon and Cameron, not so much towards Donna although her outburst did stop him in his tracks. Until she hit below the belt and he left.

Because it's less obvious. Also "might be deeper"? Joe has now shown the deepest amount of emotional attachment of anyone in this show. The rest are concrete blocks by comparison. I don't know if that's because of Lee Pace's superior acting or what but Joe expresses more care towards nearly everyone in this show than…

I understand you chose to restrict yourself to RGB, but how the pattern deviates is where the important information is usually conveyed.

You forgot the yellow which is likely the most important symbolic colour in all of this because it deviates from the pattern. A bit of an oversight to omit it.