Odas not introducing villains then having them disappear for hundreds of chapters. If he planned to do that he wouldn’t have shown the Gorosei at all he would’ve kept their abilities just as silhouetted as Imus.
Oda does that all the time .
We not see full BB fight in hundreds of chapter or his crew.
Akainu has not done shit in hundreds of chapters aside from 2 attacks on kuma .
We saw Kaido getting ready to KO people before we see him again hundreds of chapters later .
Hell he not even show off the Elders hybrid form .
Oda does this with both good and bad guys ( look how long it took us to see garp and shanks do something ).
Dragon still not make a move 25 year ongoing .
if we go by your logic all those people we see before elders would get beat first like greenbull and who knows when we will see him do something next .