First off, why doesn't everyone and their little brother do this? From the videos I've seen he remains at high hp throughout pretty much the whole jungle, can do a level 2 red buff right after Blue and Wolves, Jungles fairly quickly, and can gank like none other with a long ranged long duration stun. He can also gank right out of the jungle level 4, or right after you get red buff at level 3.
For those who do it, how do you build him? Including AP, AD and Tank.
I was thinking Armor Pen Red, either all Fort quint or 2 Fort and one either Dodge or Armor Pen, Dodge Yellows, CDR Blues. Also, it seems like he could do both 21-0-9 and 0-21-9. Recommendations?
To my knowledge AP should be fine for jungling, Death's Caress scales incredibly well with AP(1:1). I'd probably go Cloth 5 Armor into Sheen or a Wand. I think knowing when to pop the shield requires a little knowledge, soon as I'm out of class I'm going to see how many Golem hits, how many lizard hits Wraiths, ect. until the shield pops.