I think Cav started his sprint too early on today's stage (maybe he panicked or got flustered after losing Renshaw's wheel). Watch where Greipel came from to take the stage. And Greipel also almost got pipped by Sagan at the line.
Yeah, GuitarBob, I wonder how good Sagan can be if he had his very own lead out man. He is a remarkably intelligent rider who knows where to be at in sprint finales, from what I can see.