The verb tenses are going to get really complicated here because we're dealing with a hypothesis grounded in the distant past.
The first thing Hyland would have done would have been to micromanage the hell out of the place. Hyland's attention to detail at KMOX was legendary. He had enough energy not only to spend any or all hours there but he also became a part of the St. Louis power structure. Which leads to another difference: the Chicago power structure is different, much more political and union-dominated, and less likely to have been amenable to a top media executive. St. Louis was more provincial in Hyland's day; Chicago more cosmopolitan. KMOX was the only network O&O in St. Louis; Chicago had the full complement. KMOX's competition for the news and information audience was mostly KSD, which in the 1970s, seemed to be an afterthought in the St. Louis Post-Dispatch's local empire, taking a back seat to KSD-TV. Hyland traveled in a relatively small media world compared to what was in Chicago. While Hyland was corporate, he had an unusual degree of involvement in the station that he ran; today's transient media leaders seem to bounce from market to market. CBS gave Hyland free rein because what he did worked...and possibly because the prestige that the station gained, as well as the revenues, were a relatively small part of a rich corporation. Most of today's media corporations are so indebted that their accountability is to their debtholders. Hyland wasn't indebted to anyone.