Silvio at that time would only be a soldier. The name of the guy who started the fire was mentioned by tony again when he was asking ralphie about their horse getting burnt up. This is one of the many screw ups in the writing as ralph was in florida at the time and would most likely have known nothing about the job. Hell remember when Chrissy shot the bakery employee in the foot, who did he kick out the store? Gino? Hell thats Vito!