...Kanon makes sense because it is not likely that you'd get to him within a minute.
Pretty sure it actually says the revivify scroll only works on party members, as a targeting thing.
For instance, try to use it on Barth or Remira or Aradin if they die in the fight outside the grove. You won't be able to revivify them.
Withers bothers me a lot more than the revivify scrolls.
I'm the exact opposite. At least Withers has a story element surrounding his presence. You awaken a mysterious skeleton from a long abandoned crypt. He haunts your camp, occasionally speaking about eerily about fate. For some reason, he is bound in service to you.
As opposed to: here are some scrolls. They only work on party members and nobody else. Don't try to use one on Arabella. Won't work. Just cause.