Ross is also a corrupter though -- he knows Erik through the CIA work, and IIRC he's the only one in the film who calls him "Killmonger." He's helping out Wakanda but he already hurt Erik.

Does he have a chance to rat anyone out really? The interrogation goes on, then Erik blows in to rescue South African Gollum and after that Ross is in Wakanda for the rest of the movie.

I think Klaue is also supposed to stand in for the stereotype of the Great White Hunter, the only white guys who went into "darkest Africa" &c &c, like Bror Blixen (Isak Dinesen's husband).