Walter Smith got Rangers to win a lot as well.
If our under 23s were that much better than competition, it would make more sense.
Not sure when Koeman has ever achieved above expectation. He had success with Ajax and PSV over a decade ago. But Ajax went pear shaped and PSV nearly threw away title and then went pear shaped.
8 jobs, half of those only lasted about a season or less, before wheels came off. If he didn't have great playing career, I don't think anyone would rate highly.