Mutually beneficial. WVU is likely the only school he would be able to get significant playing time in 2017 since he knows our system. He will still have a lot of basic WR stuff to learn (blocking, route running) that won't be further clouded from learning his third playbook in 3 years.
WVU gets someone who knows the system very well from both a QB and WR position and will be a great deep threat if Gibson leaves.
That will also allow them to RS Maiden from California. He looks a little raw, but talented. We will have some loses after 2017 (esp White). Having a Sills, Maiden, Simms, Smothers WR set would look good in 2018 where only Sills would be gone after that season.