He did, as pointed out here before, say that a spread limit was more likely to be successful over a point requirement.
Here is what Kroll actually said about spread restrictions.
If we place spread limit on bucks and at the same time apply adequate doe harvest, the result will be a herd that at least operates near natural conditions.
Notice that he says nothing about improved breeding rates, improved productivity or improved herd health. In PA we had an adult B/D breeding ratio of 1:2 before ARs and we had higher breeding rates and productivity than we have now with ARs.
So can anyone tell us how a more natural condition helps the herd or improves hunting.