Britney-ing the Witness

There's a rumor going around, probably perpetuated by Sam Lutfi's defense team, that Britney's not testifying because she would defend Sam on the stand (even though the judge says it would cause Britney irrevocable harm to testify).
There are probably some people who buy that, some who think Sam is a good guy and didn't do anything bad to Britney. It just doesn't matter. Sam is suing the Spears family (Jamie and Lynne, but mostly Lynne for the book she wrote in 2008*) for defamation of character and causing irreparable damage to his reputation, plus breach of contract. The problem is, how can you defame a character that's already been dragged through the mud?
If Britney were to take the stand, what could she say other than, "Sam never did those things my mother alleged in her book." If she says that, then clearly the Spears' lawyers would ask her who did, forcing her to admit that she did it all to herself. Except, she wouldn't throw herself under the bus like that. She can't say her parents did it, because they were never there. Basically, if she testified and didn't want to testify against Sam she wouldn't be able to say anything.
It seems that Sam won't win in court, so he's aiming for a win with the public by making it look like Britney's team won't allow her to testify, not because it would do her harm, but because it would prove that Sam is not guilty of what Lynne alleges he's done.
Of course, it's quite possible that Lynne did exaggerate some of the things she wrote. Even if she did, how can she do more harm to Sam's character or reputation than he's already (allegedly) done to himself. How many stories have we heard over the years and restraining orders read? It would seem his character has been quite damaged already, well before Lynne even met him.
I'm not a lawyer, but wouldn't;t this backlog of evidence point to him being the kind of guy who would drug Britney and take her phones away? The Spears' lawyers wouldn't have to prove he did those things, just that he was capable of it. Truthfully, either he drugged Britney or she drugged herself. Lynne says he did it, and if her lawyers can prove he's that kind of guy, then I don't see how Sam can argue his character was defamed or reputation damaged.
Curiously, I don't remember Sam ever suing any of those other people who said all those nasty things about him. Oh, wait, they don't have Spears money. Obviously, if you're poor, you can call Sam any name you want. Get some money, and he'll come after you. Oops, I think I insinuated he's a gold digger. He might sue me for defamation. Actually, I have no money. Never mind.

*Here's the saddest thing: that book turned Lynne Spears into Dina Lohan, a woman trying to make money off her daughter's downfall. Had that book never been written, this situation probably wouldn't exist. While she's sitting in court and Sam's lawyers are reading excerpts, I hope she feels guilty.