Idk, even aside from that I don't see anyone having even a slight connection with Shanks, and so his father.
Luffy has It, but obv he Is not going against Garling.
Yeah, I suppose Oda could create something relevant for Dragon, but 1. I think Dragon will go against Imu and lose and 2. If he fights someone outside of Imu, I think he should at least fight the leader of the Gorosei.