Looks like mechanical damage from here, I'd forget it. Sounds like a lot of water, even for gritty mix. A lot of fertilizer too (I'd suggest too much, that's why it's so fat & plump as you said). Personally, if it were mine, I'd use a smaller pot. Unless the roots are huge, it's not good to have so much empty mix (assuming that's what's under the rocks). Some succulent growers use little to no fertilizer, feeling it's both unnecessary & makes for overly lush growth. Tho' I grow indoors only, my Aloes are in West window & I only fertilize them once or twice a year, in Summer only. Anyway, back to the damage, it looks like maybe it was bent against the edge of the pot, or a nearby one, looks mechanical (& not spreading) to me. I'd only be concerned if it somehow spreads.

Next year order a batch of preying mantis eggs ahead of time.

Serenade is organic www.agraquest.com

From the research I've just been doing on my early blight, which is what I see on yours (not the dreaded late blight), you need to get ALL of the affected leaves off there, because the spores are easily transferred from leaf to leaf, and yes, continue spraying. Serenade is an organic spray that's often recommended, and Daconil is also very popular (I don't know if it's organic though). And when you pluck off all those leaves (very carefully, so as not to spread the spores even more), you should bag them up very carefully and tightly, or burn them. Don't compost them, because you'll just be incubating the spores into your compost, which will cause further trouble. Good luck! We're in NJ and were nailed by the same rainy weather you probably had, so it's been quite the uphill battle for us too.