Thanks for your research. I have seen this disease and wondered at the cause. I have removed affected plants from the garden due to this disease. It seems somewhat ubiquitous in So. California. A real dissappointment for the Aloe lover.
Earlier this year, I noticed odd growth on one of my many aloes, and upon researching the condition, I learned about aloe mites. This article, however, gave me some hope that I can save some of my plants. It is very distressing to see a once healthy plant succumb to this condition. During our winter, I keep my aloes in the greenhouse to protect them from our occasional cold temps. I'm concerned now that having them in such close proximity may be a problem with infection.