The UFC 172 co-main event is a battle between two guys who deserve credit for different reasons: Davis for his sudden willingness to talk his way into relevance after his fights couldn't do it, and Johnson for his willingness to reinvent himself at a weight he could actually make.
The fight itself is an interesting proposition, as Davis is a better athlete with an ace in the hole thanks to his elite wrestling. He's become more comfortable standing, but he's not good there, so he'll tend to go back to what he knows when things start to get heated in exchanges.
The thing is, he may not get that chance against the viciously powerful Johnson. A notorious knockout artist as a welterweight, his power has carried upward across two (two!!!) weight classes, where he's put multiple 205ers to sleep during his reinvention outside the UFC. He's also a capable wrestler, and though he's not on the level of Davis, he may do enough to sprawl and brawl his way to a stoppage.
While that does seem unlikely, and Johnson's time outside the UFC was more about learning to make weight than it was about fighting elite competition, every now and then, you have to pick a dog just for excitement's sake. Consider Johnson that dog.
Anthony Johnson defeats Phil Davis by (T)KO, Round 1