I might have been wrong.
I was just looking at the page with the Ultramarines' organization in C:SM, and there the 6th company captain is listed as the Master of Rites.
So the weird pinkish red might be orange in reality, or at least supposed to be. I think the colours are wonky. The cloaks are also kind of pinkish, which I doubt is intentional. After all, the pictures are scans of a printed magazine, so there's plenty of room for the colours to be inaccurate.
The 7th Captain is the Chief Virtucaller.