These are great articles, thank you so much for sharing. The third link is just a layman's description of hte first article, so they essentially are the same. The second article is different but not clinically relevant, as the outcome is tendon thickness and character on ultrasound, not clinical athletic performance. But the first article is pretty interesting.
Now I will point out that these athletes have a different injury than me. Theirs are 2-6 cm above the bony back of the heel where the Achilles attaches, whereas my injury is exactly where the Achilles attaches. BUT, this is probably the closest I'm going to get in the medical literature on an injury like mine, so the guidance and therapy might apply to my case.
Since I am a forefoot strike runner, I am kinda doing the eccentric loading big time simply by returning to running. But that's probably with impact which is too great, too quick, and too uncontrolled compared to slow careful eccentric maneuvers described in this article.
And I have the perfect weight to load on my back... baby now 8 months old in baby backpack. I'm psyched to try the rehab regimen recommended here. Thanks so much for recommending it.
Best,
-- Josh