With the signing of Fournette is Vaughn worth holding in a Dynasty League with no taxi squad? Full PPR league
If you have the room for him certainly, if you need to clear a spot for a waiver wire add then probably not
I wouldnt drop him. If anything trade him for a draft pick and get some value back. I try to not drop any rookie I just drafted. There were people in the draft hoping he fell to them so there is still some perceived value atleast. Even if you get a 5th round for him it is something.