From the start Jerry has been the owner AND general manager. That hasn't changed.
But Jerry's perception in the early 1990's was that Jimmy was getting the lion's share of the credit. Was that true?
Maybe, but all Jerry had to do was change his perception. Pretty sure he knew Jimmy wasn't going to be the head coach for as long as Jerry was the owner and general manager. Jimmy never stayed at one school that long (though when he got to Miami and won a title he was in a much better position to win championships). In the long term Jerry, if SBs continued to follow, with Jimmy or whoever, WOULD get more credit.
But his ego wouldn't allow it.
I do wonder somewhat (but only somewhat) why , at his current age of 78, why he STILL won't hire a gm. Maybe he feels it will take too long for a new gm to put his stamp on the team and start winning rings again. Maybe he truly feels Dak and McCarthy have this team on the cusp of another title. Maybe he feels he'll live to be 100 and has plenty of time to win more SBs.
One things for sure, nobody knows exactly why he won't hire a gm. We can suppose and guess and conjecture all we want, we can even categorically state why he won't do that. But the simple fact is we don't know and maybe will never know....