We don't have a clear indication that that form is actually Anakin's body. His body was in YV hands for multiple hours, and then this is what we're given: Additionally, let's remember that Jaina herself was compelled to retrieve the body: And we also have to question exactly how did they know that the "Anakin-sized husk" was the one that contained Anakin's body? So, we have two unexplained things right there: 1) Jaina's compulsion to retrieve the body and 2) how did they know which husk contained Anakin's body. And when Tahiri questions where Anakin's body is, this is the exchange we're given (as an aside, this appears before the appearance of the husk): Oddly, he explains about the docking pit with Vergere and companions, but doesn't actually say anything about Anakin's body. Now, what about the compulsion? Why would Jaina feel compelled to retrieve the husk? For an answer to that, let's go look at Traitor for a moment: We have here one of many examples of Vergere being able to influence a Skywalker-class Force sensitive. And who was sitting right there on the field playing with Anakin's lightsaber when the strike team retrieved the Anakin sized husk? Any other complaints? I can poke holes in the "he's dead" theory all day.