Robert, it is not a fair question as Azumah Nelson was a featherweight and a good one, whilst Lou Ambers was a probable top ten lightweight and Jimmy McLarnin was truly one of our great welterweights fighting in a GREAT era of lightweights and welterweights...
IMO, I have Lou Ambers as a LW and Jimmy McLarnin as a WW over the FW Nelson in alltime ratings in their respective divisions..