GAYLE- I've been wondering the same as you if Garrido & his wife attended the Antioch congregation once he got out of prison. It was only a short time from 1988 when he exited prison till the year 1991 when he and his wife kidnapped Jaycee Dugard- only 3 years. If I was a betting man I'd conjecture they were still BOTH JW's at that time when they kidnapped Jaycee.
Problem is - like you said - IF the elders in Antioch knew anything about his past - they definitely would have kept that hushed up for sure. If there was only some way to find out. Or if any ex-Witnesses in the Antioch area knew the Garridos back in the late 1980's or 1991 who might come forward now - it could get very interesting if they reveal information about what went down inside the congregation. Any info would help