I have killed turkeys this late with and without decoys, so I don't think there is any right answer. If it were me, I'd probably use a lone hen, just in case some gobblers have been run around by a group of jakes and may shy off. I use decoys more when my son is hunting with me to try and keep the turkeys attention on something other than him trying to get a shot, otherwise I rarely use one, although I usually have it in my vest.