Forks:
Gear dogs/slots:
Fork Drum:
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Forks:
When you miss a gear going in and it pops out, it's your sloppy foot not timed; and the gear never slots in or the gear is so bad at the dogs; it can't hold the gear in and the torque pops the gear out and the forks take a bend; flex and those are the wrinkle marks. Right at the U tips, these hold the gear in so deep. Shave those tips off, the gear can float with the missing clearance gone, pops out, and ruins the tips of the dogs.
Gears:
In the one gear row, find the largest gear. That's 1st gear. Find the second largest gear on the same shaft. That's 2nd gear and so on.
So gear dog wise, those have to be sharp, not round at the ends. On one of your photos, 'A' looks pretty good, so that does not mean someone missed second a lot. But inspection is making sure they are not torn up. Rub both hands together... which stayed cold. So when part-A meets part-B, it is equal damage. A is inserted into B and when they line up and go in, some tag and those tips are chewed up so look at both when inspecting part into part, part rolling with part, etc.
If you shot that one gear tooth that is all torn up, no, normal wear. Your oil pump gears go thru the same debris crushing when it floats in the trans oil.
Drum:
Inspection for this puppy is to note the channels, but look at the staggered V curves. Those wear down. If those wear down, who causes the matching wear? See the short dowels of the fork in the channels? These are what you are looking for wear as well.
Springs:
Those obviously break and you could not grab any gear, or may be stuck in gear, can only shift one way, etc.
Could be something as simple as a shift adjustment. Someone might pop that thread up. But this is your start looking for problems. If you can look down at the bottom of the trans case, how much sparkles back at you?
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