Not only that. LSU, outside of Skenes was not improved. Thatcher Hurd was a bust until the CWS Christian little is not bigger and stronger. He's actually hurt. Also, you could say that Jay Johnson has not improved any pitchers at LSU. He just got Mariucci to buy him known good pitchers from other schools.
Also, the Skenes example is flawed, because Skenes came from a service academy with top level academics, but middle school PE coaching level athletics. Air Force training people to win WW3 not win SEC weekend series games. Probably any meat head, sport college like LSU could have served him well.