@ketsui73
Steve,
I hesitate to comment because it doesn't sound as if your conditions leave it as a possibility. But....the example in your photo shows what looks like necrosis in the mid-leaf and I see that especially in the spring on the Sanseverias when they are going outside after spending the winter months inside. It took me a while to figure out, but it's cold damage. The temps are not as consistent as the steady warmth indoors and the Sans are really sensitive to the colder temps in the spring. They aren't in the fall when temps outdoors begin to change and drop and they get exposed to the same cold temps. One reason it was hard to realize what was going on in the spring. I'm not talking actual freezing temps, but with the Sans it can occur if they get exposed to temps falling below 50F. I haven't paid attention to the aloes. They have more cold tolerance generally and that combined with some abusive care might disguise it and I don't grow nearly the smorgasboard of varieties as you have. Background genetics may be in play on that. This year we had vicious cold spell in February, so the tall Sans suffered even indoors. Lucky not to be killed outright, I guess. They are the last plant I take back out in the spring and that prevents the problem. The damage is ALWAYS in the mid leaf area, not on the tips or where it meets the stem.
Just a random observance.
