Bisping is limited and wouldn't be much of a challenge for Silva. There are rumblings that Rashad Evans wants a crack at him. He may not win, but he would offer a better challenge.
Hendo has a puncher's chance. The weight thing won't be that big of a deal since he fought Fedor at about 206 and Fedor was at about 223. Jones' length will be the problem. But don't take him lightly. He is tough as nails and will not be intimidated. He has never been knocked out. I doubt he will have any fear of Jones. It will be a war.
No fighter is invincible. I have been around long enough to remember when George Foreman was feared. In fact, there were those who feared for Ali's life when they fought. We know how that turned out.
I remember when Tyson was running roughshod over the heavyweight division, beating up everyone he met. Then, a guy named Buster came along.
Every fighter has a weakness, every fighter has a style or type of fighter that will give them fits.
Silva will probably retire in the next year or so. He has nothing left to prove, no more mountains to climb. He will always be considered one of the best of all time.
I am not even sure GSP will ever fight again. Or if he does, will he be the same? The surgery and layoff won't make him a better fighter, and he is getting older as well.
Jones is certainly on top of the mountain now. But, somewhere, there is a guy who has the style and toughness to at least give him a good go. We have not seen him face real adversity yet, have to come back from being down, tasted his own blood. I would love to see him challenge Junior Dos Santos. But, that may be a bit too much for him.