Difference between the Cal Stoll years and the PJ Fleck years is that PJ is putting lots of guys into the NFL, the team's academic performances are phenomenal and PJ hasn't lost a single bowl game.
Also, PJ took over a program with relatively little success in his lifetime, whereas Stoll took over for a Natl Title and Rose Bowl winning coach. Minnesota was still considered a blue blood at that time. If you switched Stoll and Fleck, Fleck would have made us competitive with UM/OSU, while Stoll would have us doing worse than Rutgers. Stoll was an alum with some minor success with small programs. He was the beginning of the end for Gopher Gridiron Greatness. He wasn't a bad coach, but a great coach would have done much more and got us back on track. Instead he was just successful enough to convince the admin to bring in another alum with minor success at small programs, and the cumulative long term effect of less than typical pre-mid 60s recruiting led to the U becoming a has been program.
Now I'm not saying PJ was much more than Stoll or Salem were, but PJ was THE hot up and coming coach, whereas neither Salem or Stoll came into the job with as much buzz, so I'm only arguing that Fleck, with UMn still being seen as a fb blue blood in the late 60s, could have done really well recruiting. Stoll, having to deal with Fleck's situation, would have struggled mightily.