I think he can. It does require a hand seal for release. He can learn it with ease, though. I mean, it took Sakura three damned years to store a shitty amount of chakra compared to what Sasuke handled in a few seconds, despite her low reserves granting her good control. It was several hundred times larger and potent in volume and he applied the most advanced form of Spatial and Elemental Recomposition upon it to turn it into Raiton and various weapons without mixing it with his PS, which he had turned into a Mezo-like container.
His feat was the opposite of COAT. He did that in a few seconds. Sasuke can easily learn and master Byakugou within a few seconds. But, why would he need a tech that shortens a user's lifespan? It's such a pontless tech bar its capability to mass-heal.
Yeah deff. With his Hagoromo Level of CC
Why not? Byakugou is all about chakra control and He is on Hagoromo's Level in CC.
Nah, you don't get it! The Sage's Chakra Control is shit before Sakura's. Shit!