I attribute it mostly to hyped punchers and it lingers over the head of a young guy being billed "the next coming of blah blah jones". Guys who never fully develope and some crashing down never to really recover. Berto was a great example. His flaws were glaring early and was built up on a spongy foundation but maketed-matched well. I don't think Donaire was exposed but he was outclassed, he also got lazy with all the hype and hoopla.