ProStaffSteve here’s some good related articles, one about releasing big fish that supports your premise. And the other about differing growth rates from P4 vs Rainy River. And finally one about the 25 year old Mille Lacs walleye that was eye opening.
http://www.outdoorcanada.ca/why-you-should-always-always-always-release-big-fish/
http://www.in-depthoutdoors.com/wp-content/uploads/2018/01/Pepin-Walleye-Growth.pdf