“Plus the Emperor knows that Skywalker will come to Vader, and he tells this to Vader exactly when he needs to.”
I think this is incorrect. The emporer doesn’t know Luke is there until Vader tells him he felt his presence. Then he tells him to go to endor. And he has for seen it, he is bsing Vader to make it seem like it is part of his plan.
Side note on Boba fett… wouldn’t that guy recognize Luke at Jabbas and relay to Jabba that the empire wants him bad, probably a pretty hefty price on his head.