User blog comment:Lightsuperior/Katsuka, the first ninja/@comment-7709681-20141108192753/@comment-7709681-20141109153101

About the first point, the stealth mechanic can pretty much be compared with Vayne's Q during her ult.

About the third point, we already have a max. health gap-closers, on both Maokai (Based on the target's health) and Gnar (Based on his own health).