It'll probably be a combination of both Gaara, and Sasori's style. Like maybe he'll levitate himself on his sand, while directing his puppet, and Iron Sand to fight his opponents. He's the strongest out of the new gen imo at the moment. Imagine if he start incorporating poisons with his Iron Sand.Always have to speak the truth man. I really can see his battle style similar to Sasori's without the whole puppet body inclusion, but with a mix of Gaara's intelligence and tactics as well. Gaara has always been super smart in battle. Shinki will be lethal no doubt, he's already lethal, he just needs more experience.