But these barristers appear to be saying that he doesn't necessarily need proof to win his case.

Reminds me of this Arthur Conan Doyle quote: “When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.”

I don't think Harry has eliminated all which is impossible. He's tried to eliminate things which are very possible, such as somebody at a restaurant tipping off the paps or that Chelsy's girlfriends could have been sources for stories. (How the heck would Chelsy's friends even know what various reporters look like? Anybody could have overheard them chattering about Chelsy and Harry.)

I'm just trying to be prepared for him winning because so far, he and his wife have won their cases even though the media kept insisting that their cases were weak.

It could turn out to be yet another pyrrhic victory and he could end up wishing her would have accepted the 100,000-pound settlement that was offered.

Or winning could encourage him to file even more lawsuits as other sources of income dry up.