@Antmrm Shanks' dad is a CD. A commander of the knights of G** (by this time or sometime shortly after) therefore making him one of the most politically powerful people on the planet. Also insanely rich. Only people above Garling (that we know of at this time) are the Five Elders and Imu. If Garling wants something, no matter how crazy it might seem to someone else, the answer he's going to get is highly unlikely to be no. If he wants Shanks to be in the hierarchy of people with contracts with Imu, it's going to happen. As for who told Shanks about him being noble, I wouldn't be surprised if one of the Rogers Pirates saw Shamrock and put 2 + 2 together. Remember, Roger went to Laughtale which probably had the WG SCREAMING, they would've sent out assassins on Roger's crew. Scooper Gabban all but said he's fought GK before and it wasn't at Gods Valley so the next possibility is that a GK had been sent after him.