WB said Garp is just an old man, and said Shanks is a clown like Buggy, he can say whatever he wants when WB gets butthurt, BB made WB butthurt you are missing the point, BB literally killed him, killed Thatch, captured Ace and caused war, you want him to sweet talk about BB
BB can replace them as he is the only man who can use 2 DFs at the same time and Imu sees him as same level threat as Joy Boy and Ancient Weapon while Imu himself being a DF user, who even Doflamingo thought he could beat Imu with Ope Ope fruit. Oda also said story is based on fighting vs Yonko and after finding One Piece the story will finish so the final battle is vs. a pirate not vs. Imu who is not searching One Piece.
Keep crying.