Because we don’t know much about how Garps and Roger’s fights gone, rather we know Garp and Sengoku combined allowed Shiki to destroy half of Marineford despite Sengoku calling Shiki his personal business.
Garp literally told us that they nearly killed/subdued eachother multiple times in the past. They're relative.
Also Shiki and Sengoku have destructive fruits not to mention Garp has attacks that level entire towns and nearly split Pizarro's golem in half
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