I agree that Teddy could have done that all on his own. However, the stories changed but more important was something that got buried by the media. There was a comedian Mort Sahl. He began to speak out about some inconsistencies and some strange happenings. Almost overnight all of Mort Sahl’s television appearances abruptly ended. His in-person appearances ended also. Someone or some group with a lot of power wanted to erase him.
Killing a third Kennedy brother really wasn’t an option. The earlier plane crash didn’t kill him so they had to seriously discredit him.
I saw a two-hour video about More Sahl which was very interesting.