Wow..so I tried to read every post, but basically, I'm going to say that coming out of shoes, (since I see nail holes), you shouldn't be suprised at any seedy toe. You can usually see circles of hoof rot around nail holes when you remove them...the black rings/circles. So, there's your invite to seedy toe/WLD no matter how well shod. THe nails will vibrate from the metal shoes, or the fact that there's a hole driven in, or because shoes are in themselves artificial, extensions of hoof walls ( and excess hoof wall causes flaring but the nails from shoes hold the hoof rigidly in place), however you want to look at it, it causes keratin degeneration around the nails. Perfect for funky stuff to get a head start, and it's driven up high. Plus, the shoe prolongs breakover, which is what causes flaring in a bare hoof-excess wall.
I do see flaring in your pics. Doesn't mean your horse is trimmed short. WHen walls flare that much, the hoof goes "SPLAT" onto the ground, having lost all it's support from the walls. By the way, it can happen in shod horses, the bones inside the hoof bottom out, seeking support from the sole, but never find it, they appear thin soled, but shod hooves, over time, look longer overall. Or you could say the hoof pushes up the leg. But I digress...
The flaring can be caused by fungus/bacteria, or the f/b can set up shop because there is flaring. Doesn't matter which started it all. Hen/egg scenario. So, the hoof went splat, has little/no support from the walls. They aren't helping, so should be beveled to remove them from any weightbearing role until they grow in tight and strong (from the top, 9-12 months average), then let the wall bear some weight when it is ready. In the mean time, the sole is taking on an extra burden. This is also how you build concavity, BTW, the walls have to be strong enough to bear some weight. Until then, you need some padded boots, as that sole is too thin, and working overtime, and will remain so, until you get a nice, tight WL. It's not about being too short, but too long, so you do need those walls beveled.
Also, soaks/treatments for WL are a good idea. I like Clean Trax or more frequent soaks with ACV.
Going to shoeing school may not show you how a foot really should look like. They show what a SHOD, MANMADE hoof looks like, which may be the average when all horses are shod, but don't compare to a horse's NATURAL, NORMAL hoof. Just food for thought. However, as a well-rounded part of hoof education, I recommend it, but you have to include some natural hoof care studies to get a more balanced perspective before you form your own idea of what is right.