The web search results mention Osborne Machimana winning the SA heavyweight title in 1991 and regaining it earlier, but none of the provided evidence explicitly state that Potgieter's victory made him a *two-time* champion, nor do they confirm the specific comparison to Machimana's feat. The information regarding Machimana is present in the search results, but the connection to Potgieter's specific achievement is not independently corroborated.

The evidence confirms that Chris Thompson held the title in 2022 (via Wikipedia/web search) and that he fought Potgieter. However, the claim's specific timeline—winning in 2022, losing it the same year, and winning it back from Potgieter by a seventh-round stoppage at Carnival City in August *last year*—is too specific and cannot be fully corroborated by multiple independent sources provided. The sources confirm Thompson's 2022 title holding, but not the full sequence described.

The web search results mention the 'Big Guns' tournament and the rematch, suggesting the context of the event. However, there is no evidence from multiple independent sources confirming that Larry Wainstein organized *both* the 'Big Guns' tournament *and* the first fight at the same venue.

One web search result mentions a weight comparison (Gomes weighing 10kg heavier than Potgieter), and another mentions Potgieter's weight in a general context. However, none of the provided evidence sources independently confirm that Potgieter weighed 110kg *and* that this represented an exact eight-kilogram drop from his first fight's weight.

The specific details regarding the stoppages (Emmanuel stopping Sandys in round one, Moses stopping Nhlapho in round four) are detailed in the context of the Kalengui brothers' fights. While the general success of the brothers is corroborated, these precise round and opponent details are not confirmed by a second, independent source.