Yeah with regard to Garvey and Booker T, Garvey basically took what Booker T was talking about and took it international with the concept of pan africanism and removing colonialism in Africa, where Booker T was mainly local and concentrated strictly on us african americans. So I can understand why Booker T would use his resources to give Garvey a platform, to take it further than even he had envisioned.
As for the c00n Dubois, yep later in his life after he did what he did to destroy Garvey, publicly talk down Booker T, he realized appealing to whites and his integrationishm was a failure. After the did all the dirt he did. Shameful, unfortunately his integrationism/white acceptance string seems to thrive today in white liberal and black intellectual circles.