You pick two examples and I specifically said wolves, not cougars, bears or coyotes, the Kaibab Plateau is not an argument for the preservation or introduction of wolves now.
National parks such as Yellowstone are a poor example arguing for the introduction and need for wolves. With Game Depts that manage deer and other game populations through legal hunting outside national parks, especially in the Western states its been shown wolves are not needed. They’re destructive of game animals that are legally hunted and destructive of livestock, not to mention the threat to humans if their numbers get too high.
For Kaibab, wolves were a major predator and one that were substantially reduced through hunting, etc. The results of that action is well documented.
My reply was concerning your statement that wolves are not needed for the ecosystem and that the ecosystem did fine without them for many years. I don’t believe the historical record supports those claims.
The larger point is that there is an ample record of changes to ecosystems without better understanding the possible outcomes, or changes being made to ecosystems based on bad science.