If Vaccarro is covering an NFL slot receiver, we've lost the play from the outset.
I'm hopeful that with his size and athleticism he can do a decent job on tight ends, at least coming out of the three point stance on the LOS. That's a huge and necessary upgrade over Harper. But lets not get silly here. He shouldn't and won't be covering Tavon Austin or Wes Welker or Percy Harvin.