Not really a fan of the ones covering his mouth (2 and 3), but 4 and 1 both look really good! Specially those tusks on 4, they really fit with the hero.
Great work Marul and about your issue here is a better explanation of it "Each vert can have 3 influences maximum. Also the compiler will throw away very small weights as well, which I believe is defined as anything below .1" you were right about the 3 bones =]
Well that would make sense seeing as only 1/3 of the backpacks are public. Assuming that the private backpacks contain about as much as what's in the public ones you're looking at ~2.6x as many items as shown on the website.