Some background:
Miscavige was, essentially, the general manager of Scientology during the early 1980s. The intrigue, and paranoia, of this period is covered in books such as 'Messiah or Madman?' in chapters such as 'The Billion Dollar Caper' and 'The Savior's Revenge'.
Hubbard was very concerned with being held accountable for his decades of fraudulent and abusive actions, as he "smashed his name into history," and created the Scientology "juggernaut," in accordance the the "pink legs" Bolivar PL writings.
Hubbard had his priorities, and, apparently, had a phobia for anyone with a subpoena, a badge, or anyone wearing a judicial robe. It's noteworthy that two other cult leaders, Moon of the Moonies, and Lyndon LaRouche, went to prison for things such as tax evasion, served their time in prison during which they continued to oversee their cult's operations, finally left prison, and continued as the leaders of their cults. This in contrast to Hubbard. Something to ponder.
Hubbard by could have by-passed Miscavige and established other communication lines. For example, Hubbard could have called David Mayo on the telephone. He also could have spoken with any of the major Mission holders. He chose not to do so.
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From a 1986 interview of Martin Samuels, former Mission holder and founder of Delphian school:
"Hubbard operated according to a couple of key patterns.
"The first pattern involved basically decent well intentioned people... no one was able to rise in the organization to a point of any real proximity to him, without being attacked and vilified...
"The next pattern: It's reap and rape. Hubbard would let the reins loose. He'd let people believe they really could get on with it... He'd let people believe they really could prosper to the full extent of their own ability, and enjoy the fruits of their labor.
"And, with that kind of freedom, prosperity does occur, Inevitably, though, he'd come along and rape and pillage and rip off and take what had been produced. The most dramatic example of this was '82, '83, when he 'raped' his most decent people in management along with the mission holders, and looted the entire mission network.
"And look at this pattern... He surrounded himself with absolute hooligans as 'managers'; guys who beat the shit out of people. This man, who 'is this OT, the author of Science of Survival, completely able to predict human behavior', surrounded himself with ruthless people - like Miscavige - who got there because they emulated Hubbard's savagery. They emulated his total willingness to completely break, use, and discard another person.
"And then after their hands were so bloody - and the only reason their hands were bloody was that they were doing what Hubbard wanted - when it finally started to get to the point where it couldn't be tolerated by people anymore, Hubbard wiped them out. Then he said. 'My God! I didn't know!' Scapegoat. He even did that to his own wife, who went to jail in his place..."
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Excerpt from the 1991 David Mayo article on 'Clear':
"It was PR and marketing considerations that led Hubbard to decide that certain people were 'clear' at a certain point..."
And from author Russell Miller's interview of David Mayo from August 1986:
"What worried me was that I saw some things he did and statements he made that showed his intentions were different from what they appeared to be...
"He told me he was obsessed with an insatiable lust for power and money. He said it very emphatically. He thought it wasn't possible to get enough. He didn't say it as if it was a fault, just his frustration that he couldn't get enough."
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According to Jesse Prince, from 'The ever changing tech of Scientology':
"...Miscavige is doing his best to forward Command Intention, which is contained in the huge LRH orders database of the INCOMM computer system of Scientology..." http://www.ezlink.com/~perry/CoS/Theology/jesse.htm
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About 1983:
There's been some (very little, but some) puzzled speculation over at MartyWorld as to why Hubbard would have spent his time writing science fiction novels rather than concentrating on the OT levels. The official view is that the OT levels are complete, and that Hubbard had completed his mission of giving Mankind the "Bridge," etc., otherwise why would he have spent his time writing science fiction novels?
And now there's the ambiguous "I failed" comment which was accompanied by the statement that Hubbard was going to visit a particular star and orbit it for a while, just to get his ruds in or whatever.
What a mess.