The world was stagnant. Blsckbeard didn't do shit until an opportunity arises. Which happened after Kaido/BM downfall. They literally only dared to enter Totland recently with BM out of the picture.
Blackbeard waited for the opportunities, Kaido literally did nothing when opportunities were available. When Whitebeard died, Kaido took zero of his territories, while Blackbeard took several
 
Real talk though how do folks think Roger & his crew overcame Rocks who had the likes of Newgate, Kaido, Linlin, Shiki, Ouchoku & Silver Axe under him if his two top boys Ray & Gaban weren’t monsters of the same ilk if not stronger?
Roger pirates defeated Rocks because they had Knights and Navy help

Not because Ray and Scopper
 
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