yes. The first hero with his own comic. John Stewart, while being in print first, is still a knock-off.
Not to you specifically but, just because someone would be the "premier" black hero doesn't mean that they would be the only black hero being published any more than having Batman being the premier hero of DC negates anyone else appearing.
Almost every "dream team" line up I have for the JLA or The Outsiders has both Vixen and BL on the rosters. Not because of diversity as much as I just really like both characters and wish they were as prominent in the comics as I'd like them to be.