Yoriichi did not linger at Marine Headquarters. Although he had originally intended to personally see Whitebeard off, Marine Headquarters did not want Tsugikuni Yoriichi getting too involved in this matter.
Whitebeard had been captured by Yoriichi's New Marines. In order to maximize the impact of Whitebeard's execution and ensure that Headquarters reaped the boost in prestige it would bring, Sengoku had to minimize the presence of Tsugikuni Yoriichi and the New Marines as much as possible.
Sengoku had already decided to execute Whitebeard through a live broadcast and publicize the Marines' strength.
Under such circumstances, if Tsugikuni Yoriichi appeared on the broadcast, everything Marine Headquarters had done would likely end up benefiting someone else.
Yoriichi could understand Sengoku's thoughts and plans with only a little consideration.
He was willing to cooperate, too. After all, once he and his New Marines had captured Whitebeard, their reputation among the public had already risen to a certain level. No matter how hard Sengoku tried to erase the New Marines' influence from the matter—
What Tsugikuni Yoriichi and the New Marines had done could not be hidden at all. Regardless of what Sengoku did, in the public's eyes, the person who captured Whitebeard could never change from Yoriichi into someone from Marine Headquarters.
Since his own interests would not be affected, Yoriichi naturally had no objection to what Sengoku intended to do next.
More importantly, Whitebeard's execution would be an epoch-making event for this world.
If Pirate King Roger's death had ignited the ambitions of the masses and ushered in the so-called Great Pirate Era—
Then Whitebeard's fall would calm these turbulent seas, if only somewhat.
For ordinary people, that was undoubtedly a good thing.
Against that backdrop, Tsugikuni Yoriichi stayed at Marine Headquarters for less than three days before leading the people aboard