No Woman, No Cry is as on the nose perfectly matched to teaser as any song could be. We literally see several women in mourning over the death of T’Challa, while the song is offering comfort telling them not to cry because everything’s gonna be alright…which blends into Kendrick’s defiant Alright as we see the Wakandans defiantly defend themselves against Namor and the Atlanteans…

The second question about Bob Marley being Jamaican is equally stupid - first because the version they used is performed by Tems who is from Nigeria, but secondly because a major theme of Black Panther (THE major theme of the first movie) is about the connectivity of the African diaspora with T’Challa and Killmonger as literal first cousins but one American and the other African, with T’Challa and the Wakandans learning that they need to be connected to Black people around the world. Marley is obviously part of the African diaspora, as is Kendrick, who had music all over the first movie.