It's tricky business for the UFC to be selling us a pay card topped by two apparent mismatches. The thing is, though, what really pushes fans to fork over the dough to watch is star power. Barão doesn't have it, whether because of the language barrier or a lack of stout challenges. Maybe that'll change someday, perhaps when Dominick Cruz returns to reclaim the belt he believes is his. But for now, for UFC 173, the stars will be shining most brightly in the co-main event.