"Stubs" suggests to me that either his arms had been amputated above the elbows or (just possibly) something like Thalidomide. Thalidomide wasn't used in the US in the way it was in the UK but it was used in Canada. Thalidomide-affected babies were born between about 1957 and 1961, so they would have been aged 20-24 at the time of BG's murder. I wonder how old the man with "stubs" was.
For obvious reasons I wouldn't see him as a suspect.
Thalidomide is reported to have been used in the US and covered up by drug company manufacturers and doctors. There are reports of a doctor in Texas using it. Babies were born with these types of deformities and more severe ones in which babies died. Deformities were attributed to something else as reports were emerging in Europe implicating Thalidomide. You can find information on this by googling.