Jack Paar's first sidekick

After Steve Allen left "The Tonight Show" in 1957, NBC planned to fill the 90+ minute slot with several nightly game shows, all hosted by Jack Paar.  But putting all of that together proved too much, so they scrapped the idea and put Paar on as atalk-show host.  For the next 8 years (both in late night and, later, in prime time) he was a master of the game.  His sidekick for much of that time was Hugh Downs, who stepped in after the original sidekick (actor Franklin Pangborn) was let go.  Apparently, Pangborn did not exhibit enough "spontaneous enthusiasm."  I find that hard to believe judging by this clip:the intro from the very first Jack Paar "Tonight" show.  I'm wondering if he just was too old to keep up with Jack during the interviews.  All those shows are long-gone, so we may never know.