You should figure out that Korolev died when it came out his Moon project would be not realised most probably. It was medical mistake, believable, but no medicine could save someone lost interest to life anyway.
Gagarin, should be, was intentionally killed, when it became completely clear - for specialist - what USSR would not be at Moon first, while Soviet program was smaller, so would not impress people at second place, and there was no resources for bigger one at reasonable amount of time.
They would not came to tell anything. They said anything needed by their passing.
As of me - I am not Gagarin, nor Korolev. I am specialist at other area, of, You know, false ideas and ways to dispel these. But if someone has these at clinical degree, and these could not be dispelled by facts, and experimental proofs proving these, than it's not to me, of course, but to psychiatrist.