What if he's the smartest? You can't rely solely on intelligence, if what you're saying is true, then he can beat anybody in Narutoverse by planning out a 1000 strategies. No.
Dude, 2D Shadows are extremely easy to avoid, that's like Shadow Imitation and such..baby jutsus. The 3D ones are the dangerous ones and the Byakugan can cut through that. Besides, say that he is caught in a 2D shadow and then Shikaku uses that Shadow Sewing technique (3D), the Hyuuga can emit chakra from any point in their body without moving, just like Neji did against Kidomaru. This would render Shikaku's 3D shadow useless.