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Let's say Dio leaves the band a little sooner, and Iommi in a stroke of creative genius pumps out the album and brings in Tony Martin to replace Dio.
Does the release allow Black Sabbath to continue charting Gold? IOTL, they released a bunch of stinkers after DIO left until Headless Cross, which at this point was too little too late, as Black Sabbath was reduced to touring in Soviet-bloc states their popularity had waned so profoundly.
True hair rock fans may appreciate that Headless Cross was a thoroughly phenomenal album, whose short length and dated production would be non-factors in 82. It is certainly a better Album than any of Dio's and his first three were all pretty good.