Under which situation is he more able to continue to talk about what he knows, to any extent he wants...a) free; or b) in captivity?
You said he 'wants', not 'I believe he wants'.I don't have to prove it, it's what I believe his motivation to be. And the reason I believe it to be his motivation is based upon his actions. He could have said everything at once, but he didn't. He strung it out over multiple occasions. He could have easily said everything he wanted to say, and then face the legal charges against him.
You made a matter-of-fact statement, when all you had was that you 'believed'.
So, you make factual/matter-of-fact statements knowing you do not actually know the facts.
Have a nice day.