How does the Rastafari Movement reflect on themes of the African diaspora?

I would like to extend the definition of the African diaspora to include all people of African heritage, including the descendants of former slaves.
The founder of Rastafarianism, Leonard P. Howell was once an acolyte of Marcus Garvey's Pan Africanism Movement, the focus of which was to create a world government for all black people. Garvey was the descendant of former enslaved Africans and experienced the widespread injustice that people of African descent faced at that time in history. Howell was heavily influenced by the ideals of Marcus Garvey; therefore, Rastafarianism draws heavily on Pan Africanism and African themes.
Because enslaved Africans and their descendants were oppressed by the white man and his white god, the Rasta movement created a black god. The movement identified His Imperial Majesty, Emperor Haile Selassie I of Ethiopia, as this prominent figure. Leonard Howell taught that Selassie I was Jah, the incarnation of god. The Rasta flag is basically an inverted Ethiopian flag and features a lion. The lion represents the lion of Judah. In Judeo-Christian belief, the lion of Judah is the promised Messiah. According to Rastafarian belief, that promised Messiah was Selassie I, who is identified as the second coming of Jesus. Rastafarian religious art sometimes depicts a black, dreadlocks-wearing Messiah hung on a crucifix.
The Rastafarian movement addressed the theme of self-image, urging black people to love themselves. The main identifying mark of a Rastafarian is dreadlocks. The hairstyle embraces the tightly coiled hair of people of African descent and seeks to silence the notion that hair must be straightened to be considered beautiful.
Self-reliance is a major value of Rastafarianism. Self-reliance seeks to restore a strong community bond, which the Babylon system is blamed for tearing down in its exploitation of members of the African diaspora.