It actually is, pretty sure it's the rarest chase in game. Currently only Choza, Jigokudo, and 2 Kakashis have it and only very few p2w ninjas will come with it later on.

No it's not, just from top of my head i can think of Kimimaro/Hidan/Yamato/Baki and Sasuke sort off, and these are only easy to get ninjas everyone has access to, there is few more rarer ones. Lowfloat to Knockdown is only found on normal Kakashi, rest are all rare pulls or event ninjas and even then only few.