Henderson isn't good anymore, and I believe Machida will expose him. I know this is a massively unpopular opinion, but based on what I've seen from him lately I'd say he doesn't have it anymore. He lost to Jake Shields who is a natural welterweight, he got pummeled before KOing a shot Fedor, he gassed in a sloppy fight with Shogun who also gassed and isn't great anymore (see: struggling to beat Vera), and all of a sudden people think because he's on a winning streak and he's back in the UFC he's great again.
I'm not buying it, and Machida will expose and FINISH Hendo.
Dan's still a pretty good fighter, he was beating Shogun down until he gassed and Fedor was a Heavyweight, but I do believe Machida will light him up and maybe finish him late.