This is a very smart move by Florian, but the article is right when it says Florian doesn't posses the physical skills of GSP.
I still don't see Florian taking out BJ. In fact, I think BJ is a little better in every aspect of the game. Florian's biggest strengths, his BJJ and striking, are also BJs and BJ is better at both IMO. Still a good match up though and Florian is definitely deserving of his title shot. And if BJ doesn't train hard for this fight maybe Florian could pull it out with his cardio, which is the only aspect I see in Florians favor.