A small crowd consisting of roughly thirty or more people surrounded Kenny with two men challenging him to a fight he didn't ask for, nor did he want to take part in. It was unfortunate that the man was held "responsible" for the failures of these two even though he outperformed them when Kong held contests for his inventor/second-in-command position.
When Kenny won, rightfully, these two took it upon themselves to seek revenge on him and ended up blowing up one of Kong's arms which landed both of them in Fort Horizon.
Because Kenny had contended for the position of inventor/second-in-command, he built for Kong his first prosthetic arm which eventually led the man to want a second, thus having a set of large arms to match his name and aesthetic.