Pierre Bouchard yes that was pretty devasting, but he Robinson also had a couple bouts one of which Jonathon I believe had the upper hand by a slim margin and the rematch turned out to be a draw.
I can only find documentation on Robinson and Jonathan fighting once, a 1-punch win for Larry in a largely nothing fight that didn't get majors
http://www.dropyourgloves.com/Fights/GameEvents.aspx?Game=38830&Fight=69769#Fight69769
The Dave Hutchison loss is well known. Hutchison was one of the better fighters of his era, with a significant fight card: Snepts, Dennis Hextall, Magnuson, Tiger Williams (x3), Durbano, the Hound and the Wolfman, Plett, Holmgren, Secord, Playfair, Polonich, Nilan, Peplinski, Wensink, Gare, Jack Carlson, Kevin McClelland, Kluzak. Seriously underrated. No disgrace to Robinson for losing to a legitimate heavyweight.
Dryden worrying about his loss is so overblown. Robinson didn't need to fight a lot because Montreal had guys like Chartraw, Tremblay, Risebrough, Lupien, and Connor to do the heavy lifting. Still, Don Cherry always has said the worst thing you could do was get Robinson angry and "wake him up." Though he was more likely to drive a guy through the boards than drop the mitts.