Huh?
If you want to play a potential up-and-coming world class CB at RB - then, Khusanov is the perfect pick.
On the other hand, if you want to start a world class RB, who defends well, can read the game at RB, presses well, and is able to seamlessly transition forward into an attacking role, able to put deft crosses into the middle, and to interchange with our RW, able to cut inside and create dangerous opportunities by dribbling past defenders...
Well, Khusanov is obviously not the best fit.
Nunes as backup RB is fine - but a WC RB able to do all of the above is what we need.
And, I don't for the moment believe, that no such player in the entire world is available to sign.