Will Vance play? Or pickup Herndon with Knox as week 5 fill-in?

14 team league 1/2 ppr. I’ve got Vance but it’s tough to know if he’s gonna play. I have Dawson Knox as a backup. I was planning on claiming Herndon off waivers (just got dropped) and dropping Vance since Herndon seems like the better play long term. Thoughts?