Why didn't he cast on Raikage? I don't know. Possibly plot as Bee was caught in Genjutsu at V1 speed without any effort whatsoever. Deidara was at an immense distance from Sasuke, but was caught regardless, and twice at that. Manda was caught in genjutsu so quickly that when the bomb went off, Sasuke had to summon. So one can imagine the window within genjutsu was cast, as summoning actually takes a bit of time.
Obito's eye was being used to control Kurama, that's why. Nope. Count the instances on the panels. Bee was lunging at Sasuke. Start counting the time hypothetically from this instant. He gets caught right here, shudders to a stop and then skids to the ground. As he was moving at such a high speed, there must have been certain Final Velocity before he completely stopped.
Sasuke is shown to be panting, and looking down at Bee for a few moments, then he turns around. Just as he starts to walk, Bee breaks out and attacks him. Do you think all this happened in 1 or 2 seconds? Complete impossibility. It was no less than 12 seconds.