Yeah, Rwanda does have a weird degree of power in the region. Does this indicate any possible souring on Kagame from the US?
South Africa hasn't gotten its marching orders from the US recently. Or ever.
But ordering hitmen is not something particularly hard to do.
Nor is invading Eastern Congo- there isn't much central authority there to begin with. Museveni was also running around the region back in the late 1990s alongside Kagame (with disastrous effect).
But it remains to be seen whether this will affect Kagame's reputation as an autocratic technocratic reformer who's turned his country into some sort of IT powerhouse. Because it hasn't really, Kenya remains unquestioned in that field for the region.