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Why are half of the animations missing?
There's an idle animation, damage and death animations, and there's at least either a cast, attack, or shooting animation. Many "combat units" have the remaining animations, including a walk animation and a "funny" animation, if you will. If not, the attack/shooting/cast animation (meaning if any of these exist) can be used as a cast/shooting/attack animation (meaning if any of these are needed).
So, does that mean that the entire "half" of the missing animations is just one walking animation? (which isn't always missing)
For the Evil Eyed, this isn't a problem; they can simply "float" in space while playing the idle animation. This isn't a problem at all. For the Adepts (if they don't have a walking animation), you can basically do the same thing.
If anything, I completely understand the reluctance to deal with this nonsense; I just don't see the point in justifying it by inventing problems out of thin air.
Added 6 minutes later
Regarding the Manticore, by the way. The differences between the un-upgraded model and the upgraded model are minimal (horns and tail).
But there are very big issues with the original animation (the horns fall into the mane, the tail has a break, the animal itself almost falls face-first onto the ground). These are all issues that were present in the original game.
FrozenSoul fixed all of this quite recently, and it was looking very good; the work was almost finished, but I haven't received any new updates from him on this topic lately, so he may have abandoned the Manticore.