Board Thread:Naruto Discussions/@comment-3568954-20160615123337/@comment-9782468-20160615145642

Absorbing chakra isn't a common trait, which is why things like the Preta Path are useful.

Absorbing people's chakra doesn't absorb their memories, so your clone wouldn't have the knowledge to copy your opponent's techniques.

Basically you could already create a Shadow CLone and use the Transformation technique to make a "copy" of your opponent. It just wouldn't have their jutsu