McCaffrey could be the type of receiver Hundley needs. In TC he got open and made difficult/contested catches.

Janis could be on the way out, replaced by Davis on kick returns, and apparently equaled by Jones as a gunner.
Davis could be on the way out, still not the most reliable fielding punts or kicks, and guilty of bad decisions returning both. McCaffrey could take over on punts.

If it was up to me to chose between the two, I would keep Janis for the coverage units.