Both WWE and TNA have champions that could arguably destroy pretty much any other professional wrestler in the world, regardless of promotion. Both are huge, athletic, with strong wrestling backgrounds, and knowledge of how to fight. How do you beat a guy like that? Sometimes an 'exceptional performance' is enough to defeat a 'better' athlete but when the gap is too big, what then? This is why weaknesses need to be worked into a character. Guys like Daniel Bryan have obvious weaknesses, their size, and a guy like John Cena may have a lot of heart but he has very limited technical wrestling knowledge (plus, we've now seen what happens when someone even BIGGER comes along). For a guy that seems unstoppable, there needs to be a chink in the armor. Bobby Lashley, for example, is definitely entering the prime of his career, he is physically almost impossible to stop, but what does he lack? Mic skills. Someone being able to get into the head of Lashley could be his weakness, someone who can piss him off so badly that he has so much anxiety over it that he isn't performing up to snuff, he is making mistakes, and an exceptional performance by his opponent can see him lose it all. As demonstrated, weaknesses are what allow for interesting stories to develop. Someone fighting against the odds and finding a way to take down their more impressive adversary can make for very compelling television. And this is why David vs. Goliath matches work so well. Brock Lesnar is unstoppable, he destroyed the guy most people can't even beat, now what is the rest of the roster supposed to do? A little guy may be the least likely to be able to stop a monster but they are also the one that everyone will get behind the most. Especially if there is a glimmer of hope. For Lesnar it would easily be overconfidence, a problem that has fell many empires throughout history, and a problem Lesnar would understandably have given how dominant he has been. It only takes three seconds or slipping into a bad situation to see Lesnar lose a dominant contest, look at how Frank Mir managed to defeat him in a legitimate fight, and it is that kind of weakness that makes wrestling so interesting. Wrestling thrives on 'at any time, given the right circumstance, ANYONE can lose'. Even a 'weak' champion is booked like they are in a cycle of overcoming the odds until people begin to wonder if anyone can defeat them. There is a hole in every game, no matter how good, and while wrestling fans are caught up in 'who will beat them', I think the real fun is in finding out 'how'. How can anyone topple the giant? How can anyone overcome the strategists gameplan? How does anyone overcome the odds? Wrestling in a nutshell.